As a result, when a boat goes 30 km up a river in the same amount of time, its speed in still water is 20 km/h.
what is equation ?The numeral is said to be in this simplest form when divided into its smallest equivalent fraction. How to do to find the most basic form. Find common factors in the denominator and numerators. Verify a fractional integer to verify if it passes as a prime number. A statement having two collinear and an equally sign in the middle is called an equation in mathematics. The general form of any equation contains the degrees of all the variables in descending order. The normal form of a linear function is an x + b = 0. The general form of a linear equation with two variables is an x + b y + c = 0. (or something similar). Equations can be categorised as identities or conditional equations. An identity holds true regardless of the value given to the variables.
given
Let the boat's speed in calm water be x km/h.
Boat speed downstream is equal to x plus 5.
Upstream boat speed is equal to x - 5
Distance x time speed
Time is therefore determined by speed and distance.
Boat travel time is equal to 30/km upstream (x – 5)
50/(x + 5) is the time it takes a boat to travel 50 kilometres downstream.
Since the boat takes the same amount of time in both scenarios, 30 (x + 5) = 50 (x -5), 30 x +150 = 50 (x -250), 20 (x = 400), and 20 (x = 20).
As a result, when a boat goes 30 km up a river in the same amount of time, its speed in still water is 20 km/h.
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Two bicycle ramps each cover a horizontal distance of 8 feet. Once ramp has a 20° angle of elevation, and the other ramp has a 35° angle of elevation
How much taller is the second ramp than the first?
Given right triangle ABC, where side "c" is the hypotenuse, angle B measures 42 degrees, and side c measures 18 m, find the length of side b.
The length of side b of the given right angle triangle using law of sines is; b = 12.044 m
How to use the law of sines?The law of sines states that when we divide side "a" by the sine of angle A, it is equal to side "b" divided by the sine of angle B, and also equal to side "c" divided by the sine of angle C
Thus;
a/sin A = b/sin B = c/sinC
The parameters are;
B = 42°
c = 18m
Since c is the hypotenuse, it is the side that will be opposite the right angle and so;
C = 90°
Thus, using sine rule;
c/sinC = b/sin B
18/sin 90 = b/sin 42
b = (18 * sin 42)/1
b = 12.044 m
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A caterer for a wedding reception wants to use a recipe for eggplant salad that recommends using 0.7 kg of eggplant for guests. However, in her area, eggplant is only sold by the pound. If 70 guests are expected, how many pounds of eggplant should the caterer purchase?
By performing a change of units, we will see that the caterer should purchase 107.8 lb
How many pounds of eggplant should the caterer purchase?First, let's find how many kilograms are needed. We know that the recipe recomends using 0.7kg per person, and there are 70 guests, so an estimate of the mass needed is:
M = 70*0.7kg = 49 kg
Now weneedto do a change of units, we know that:
1 kg = 2.2 lb
Then we can rewrite:
49 kg = 49*(2.2 lb) = 107.8 lb
The caterer should purchase 107.8 pounds
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Jacob has a smart phone data plan that costs $25 per month that includes 5 GB of data, but will charge an extra $20 per GB over the included amount. How much would Jacob have to pay in a month where he used 4 GB over the limit? How much would Jacob have to pay in a month where he used went over by � x GB?
The amount Jacob has to pay in a month where he used x GB over the limit is y=25+20x.
What is an equation?In mathematics, an equation is a formula that expresses the equality of two expressions, by connecting them with the equals sign =.
Given that, Jacob has a smart phone data plan that costs $25 per month that includes 5 GB of data, but will charge an extra $20 per GB over the included amount.
Amount Jacob has to pay in a month where he used 4 GB over the limit is
25+4×20
= $105
Amount Jacob has to pay in a month where he used x GB over the limit is
y=25+20x
Where, y is total amount of money
Hence, the amount Jacob has to pay in a month where he used x GB over the limit is y=25+20x.
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Answer:
Step-by-step explanation:
I don’t know just 5 point
Part A Create the smallest cylinder possible with the tool, and record the values o cylinder by the given scale factors, and then record the resulting volumes ( cylinder. BI UX² X₂ 12pt Original Cylinder Radius (units) 2 Scale Factor (k) AV Radius Height (units) funite Height (units) A 6 Volume (V) 13 13 E Volume (cu. unit: 8 Vxk³. scaled cylinders are 2, 3, and 4
The original cylinder has a radius of 2 units and a height of 13 units, and its volume is given by the formula: V = πr²h = π * 2² * 13 = 104π cubic units.
How you can create the smallest cylinder?Original cylinder: The original cylinder has a radius of 2 units and a height of 13 units, and its volume is given by the formula: V = πr²h = π * 2² * 13 = 104π cubic units.
Scaled cylinder 1: The first scaled cylinder has a scale factor of 2, so its radius is 2 * 2 = 4 units and its height is 13 * 2 = 26 units. Its volume is given by: V = πr²h = π * 4² * 26 = 672π cubic units.
Scaled cylinder 2: The second scaled cylinder has a scale factor of 3, so its radius is 2 * 3 = 6 units and its height is 13 * 3 = 39 units. Its volume is given by: V = πr²h = π * 6² * 39 = 1764π cubic units.
Scaled cylinder 3: The third scaled cylinder has a scale factor of 4, so its radius is 2 * 4 = 8 units and its height is 13 * 4 = 52 units. Its volume is given by: V = πr²h = π * 8² * 52 = 3072π cubic units.
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A triangle with a perimeter of 48 meters was created from a triangle with a perimeter of 3 meters using a scale factor. What is the scale factor?
A. 72:1
B. 16:1
C. 128:1
D. 144:1
Can someone help is for geometry
A truth table deconstructs a logic function by outlining all possible outcomes the function might achieve.
Explain about the truth table?A truth table offers a way to map out the potential truth values in an expression and predict their results. The table has a row for each conceivable combination of truth values and a column for each variable in the expression. There is also a column that displays the results of each set of values.
For propositional logic formulations, this tool builds truth tables. There are numerous formats available for entering logical operators. As an illustration, the propositional formula p q r could be represented as p / q -> r, p and q => not r, or p && q ->!r. You can enter the connectives and as T and F.
P Q (Q ∧ P)
F F F
F T F
T F F
T T T
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Please help will mark Brainly
The required value of exponential function for the given values of x are 1.43, 1 , 0.7.
What is exponential function?
Calculating the exponential growth or decay of a given collection of data is done using an exponential function, which is a mathematical function. Exponential functions, for instance, can be used to estimate population changes, loan interest rates, bacterial growth, radioactive decay, and disease spread.
According to question:We have,
f(x) = [tex](0.7)^{x}[/tex]
So, at x = -1
f(x) = (0.7)^-1
f(x) = 1.43
At x = 0
f(x) = (0.7)^0
f(x) = 1
At x = 1
f(x) = (0.7)^1
f(x) = (0.7)
Thus, required value of function are 1.43, 1, 0.7
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please try on this and please give explanation
Answer: In the figure above, clearly the line L is perpendicular to x-axis and passing through the value 'c' on x- axis. So, the equation of a line perpendicular to x axis is x = c
a project consists of 150 jobs. the expected completion time for each job is given in days. the project has three critical paths with two jobs in common, j and k. in order to finish the project one day early, the completion time should be reduced one day for
Reducing the completion average time for Jobs J and K by one day will shorten the overall project completion time by one day, allowing the project to finish one day early.
In order to finish the project one day early, the completion time for Jobs J and K should be reduced by one day. This is because these two jobs are part of the three critical paths of the project. By reducing the completion time for these two jobs by one day, the entire project will be completed one day early. This is because the critical paths are the paths that will determine the overall project completion time. By reducing the completion time for these two jobs, the overall project completion time will be shortened. This will allow the project to be finished one day earlier than expected.
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5. a random sample of 500 subjects measured their systolic blood pressure, and if they were a smoker or not. the goal is to evaluate if average systolic blood pressure differs by smoking status. summary sample statistics on the dataset follow:
There is a difference in average systolic blood pressure between smokers and non-smokers.
To evaluate if average systolic blood pressure differs by smoking status, we need to calculate the mean systolic blood pressure for both smokers and non-smokers. We can calculate the mean systolic blood pressure for smokers by taking the sum of systolic blood pressure values for all smokers in the sample, divided by the number of smokers in the sample. This formula can be written as:
Mean Systolic Blood Pressure for Smokers = (Sum of Systolic Blood Pressure Values for all Smokers) / (Number of Smokers)
Similarly, we can calculate the mean systolic blood pressure for non-smokers by taking the sum of systolic blood pressure values for all non-smokers in the sample, divided by the number of non-smokers in the sample. This formula can be written as:
Mean Systolic Blood Pressure for Non-Smokers = (Sum of Systolic Blood Pressure Values for all Non-Smokers) / (Number of Non-Smokers)
Once we have calculated the mean systolic blood pressure for both smokers and non-smokers, we can compare the two means to evaluate if there is a difference in average systolic blood pressure between smokers and non-smokers.
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The number N of locations of a popular coffeehouse chain is given in the table. (The numbers of locations as of October 1 are given.)Year 2004 2005 2006 2007 2008N 8,574 10,238 12,440 15,006 16,676a. Find the average rate of growth between each pair of years.2004 to 2006 _____ locations/ year2006 to 2007 _____ locations/ year2005 to 2006 _____ locations/ yearb. Estimate the instantaneous rate of growth in 2006 by taking the average of the last two rates of change in part (a).c. Estimate the instantaneous rate of growth in 2006 by measuring the slope of the tangent line through (2005, 10,238) and (2007, 15,006).d. Estimate the instantaneous rate of growth in 2007 by measuring the slope of the tangent line through (2006, 12,440) and (2008, 16,676).e. Compare the growth rates you obtained in part (c) and (d). What can you conclude?1. The rate of growth is increasing.2. The rate of growth is decreasing.3. The rate of growth is constant.4. There is not enough information.
a. To find the average rate of growth between each pair of years, we can use the formula: (end value - start value) / (end year - start year).
2004 to 2006: (12,440 - 8,574) / (2006 - 2004) = 3,866 / 2 = 1,933 locations/year
2006 to 2007: (15,006 - 12,440) / (2007 - 2006) = 2,566 / 1 = 2,566 locations/year
2005 to 2006: (12,440 - 10,238) / (2006 - 2005) = 2,202 / 1 = 2,202 locations/year
b. To estimate the instantaneous rate of growth in 2006, we can take the average of the last two rates of change from part (a).
(2,566 + 2,202) / 2 = 2,384 locations/year
c. To estimate the instantaneous rate of growth in 2006 by measuring the slope of the tangent line through (2005, 10,238) and (2007, 15,006), we can use the formula:
(15,006 - 10,238) / (2007 - 2005) = 4,768 / 2 = 2,384 locations/year
d. To estimate the instantaneous rate of growth in 2007 by measuring the slope of the tangent line through (2006, 12,440) and (2008, 16,676), we can use the formula:
(16,676 - 12,440) / (2008 - 2006) = 4,236 / 2 = 2,118 locations/year
e. Comparing the growth rates from part (c) and (d), we can see that the growth rate in 2007 is less than the growth rate in 2006. So we can conclude that 2. The rate of growth is decreasing.
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A store sells two sizes of fresh wreaths. An 18-inch wreath costs $15, and a 22-inch wreath costs $30. In one day, the number of 22-inch wreaths sold was FOUR more than TWICE the number of 18-inch wreaths, for a total of $645. How many of each were sold?
The number of 18-inch wreaths is 7, and
the number of 22-inch wreaths is 18.
What is a linear equation?When an algebraic equation is graphed, it always results in a straight line since each term in a linear equation has an exponent of 1. For this reason, it is referred to as a "linear equation."
There are both one-variable and two-variable linear equations.
Given the cost of an 18-inch wreath = $15
cost of a 22-inch wreath = $30
let the number of 18-inch wreaths be x and the number of 22-inch wreaths is y,
the total cost of both wreaths = $645
cost of x 18-inch wreaths = $15x
cost of y 22-inch wreaths = $30y
equation is,
$15x + $30y = $654
and the number of 22-inch wreaths sold was four more than twice the number of 18-inch wreaths,
y = 4 + 2x
substitute the value of y in the equation
15x + 30y = 645
15x + 30(4 + 2x) = 645
15x + 60x = 645 - 120
75x = 525
x = 525/75
x = 7
and y = 4 + 2x
y = 4 + 2*7
y = 18
Hence store sells 18 22-inch wreaths and 7 18-inch wreaths.
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h(n)=2/n -2 solve inverse function
Answer:
2/n+2
Step-by-step explanation:
Please answer this question for me
Using properties of triangles, Correct options are A,B and D. AE = EB, EG || AC and AC = 2 EG.
A triangle has three sides, three angles, and three vertices, which are its characteristics.
A triangle's total internal angles are always equal to 180 degrees. This is referred to as the triangle's angle sum property.
Any two triangle sides can add up to a length that is longer than the third side.
A triangle's total angles are always 180 degrees.
A triangle's outside angles are always a sum of 360 degrees.
The total of the parallel interior and exterior angles is additional.
From the given figure,
As E is the mid point of BA,
So, BE = EA
As it is clearly seen that EG is parallel to AC = EG||AC
Further,
As, EG is intersecting AB and BC at mid points,
⇒ AC = 2EG
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How do I do this problem I do not get it do I add when I found the volume of both
Answer:
206
Step-by-step explanation:
cube volume = 5*5*5 +3*3*3 = 125+81 = 206
a) Estimate the initial and final amounts of water contained in the pool.
The initial amount of water contained in the pool was __ thousands of gallons.
The required initial and final amounts of water contained in the pool are 46 ans 26 gallons of water.
Explain about Graph?A graph is made up of vertices, or points, and edges, or lines connecting those vertices. In addition to linked and disconnected graphs, weighted graphs, bipartite graphs, directed and uncorrected graphs, and simple graphs, there are many other forms of graphs.
According to question:As graph says
The initial amount of water contained in the pool is
at t = 0
= 46 gallons of water
And at t = 5, is final amount of water in pool
= 26 gallon of water
Thus, there are 46 ans 26 gallons of water.
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Given that f(x) = x3, which equation describes the graph of function g?
The equation which represents the graph function is g ( x ) = f ( x - 3 ) + 3
What is Equation of Graph of Functions?Graphs behave differently at various x-intercepts. Sometimes the graph will cross over the x-axis at an intercept. Other times the graph will touch the x-axis and bounce off.
Identify the even and odd multiplicities of the polynomial functions' zeros.
Using end behavior, turning points, intercepts, and the Intermediate Value Theorem, plot the graph of a polynomial function.
The graphs cross or are tangent to the x-axis at these x-values for zeros with even multiplicities. The graphs cross or intersect the x-axis at these x-values for zeros with odd multiplicities
Given data ,
Let the function be represented as A
Now , the value of A is
f ( x ) = x³ be equation (1)
Now , the graph of the function f ( x ) is plotted with the exponent value meeting closely at ( 0 , 0 )
And , the function which describes the function g ( x ) is given by
g ( x ) = f ( x - 3 ) + 3
Hence , the function is g ( x ) = f ( x - 3 ) + 3
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How do you factor this problem by grouping?
4x∧3-3x∧2-28x+21
Answer:
(x^2 - 7)(4x - 3)
Step-by-step explanation:
first, we split the expression by grouping the first two terms in parentheses and the last two terms in parentheses. this gives us:
[tex](4x^{3}-3x^{2})(-28x+21)[/tex]
next, we factor out the GCF of each group. this gives us:
[tex]x^{2}(4x-3)-7(4x-3)[/tex]
finally, all you have to do is take each factored-out term and put them together into a group/expression. the leftover expression from both groups is the same value, so you get:
[tex](x^{2}-7)(4x-3)[/tex]
hope this helped, good luck!
which of the following is equivalent to the probability of less than 50% democrats in a sample size of
Probability of less than 50 % democrats for the example based on sample proportion is equal to 0.1562.
Sample size 'n' = 100
Registered voters 'p' = 55%
= 0.55
σ = √ p( 1- p )/ n
= √0.55( 0.45)/ 100
= 0.04975
Mean 'μ' = 55%
= 0.55
Probability of getting less than 50% democrats in a sample size of 100 voters
X = 0.5
Z = ( X - μ ) / σ
= ( 0.5 - 0.55) / 0.4975
= -1. 005
= -1.01
p-value pf -1.01 is equal to 0.156248
Therefore, the probability of getting 50% democrats for the given sample size id equal to 0.1562. The given example represents sample proportion.
The above question is incomplete , the complete question is :
In a congressional district, 55% of the registered voters are Democrats. Which of the following is closest to the probability of getting less than 50% Democrats in a random sample of size 100?
Is this an example of a sample proportion OR a sample mean?
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Select the 2 fractions that are equivalent to 1
Answer: Anything that has the same two numbers
Step-by-step explanation:
You don't have a picture, so I'm basing this off of what I know. A number over another number that is the same is equivalent to one.
List the elements of each of the following sample spaces: (a) the set of integers between 1 and 50 divisible by 8. (b) the set S = (x1x2 + 4x - 5 -0. (c) the set of outcomes when a coin is tossed until a tail or three heads appear. (d) the set S = {x|2x - 4 20 and x < 1)
a)The set of integers between 1 and 50, divisible by 8 are given as.
S={ 8,16,24,32,40,48}
b ) Hence, the set {-5,1}
c) The list of set of outcomes when a coin is tossed until a tail or three heads appear will be.
S={T,HT,HHT,HHH}
d) S={Europe, Asia, Australia, North America, South America, Africa, Antarctica.}
a) We have to find a list of integers between 1 and 50, divisible by 8.
Keep in mind that the S is the event that represents the sample space. The set of integers between 1 and 50, divisible by 8 are given as.
S={ 8,16,24,32,40,48}
b) We need to list the set S= {[tex]x| x^2+4x-5=0}[/tex]}
[tex]x^2+4x-5=0\\\\x^2+5x-x-5=0\\x(x+5)-(x+5)==\\(x+5)(x-1)=0\\\\x=-5 , x=1[/tex]
Hence, the set {-5,1}
c) c) We have to find a list of the set of outcomes when a coin is tossed until a tail or three heads appear.
Let T denote the event that tail appeared.
Let H denote the event that head appeared.
The list of set of outcomes when a coin is tossed until a tail or three heads appear will be.
S={T,HT,HHT,HHH}
d) We need to list the set
S={x ∣ x is a continent}.
There are 7 continents:
S={Europe, Asia, Australia, North America, South America, Africa, Antarctica.}
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What is the chance of exactly 1 of population members A , B, and C being in a sample of 100 , drawn randomly from a population of 100,000?
The chance of exactly one of population members A, B, and C being in a sample of 100, drawn randomly from a population of 100,000 is 0.0003%.
What is the chance of exactly 1 of population members A , B, and C being in a sample of 100 , drawn randomly from a population of 100,000?The probability of exactly one of population members A, B, and C being in a sample of 100, drawn randomly from a population of 100,000, is equal to the product of the probability of selecting each of the members and the probability of not selecting the other two members. Mathematically, this is expressed as: P(A, not B, not C) = (1/100,000) x (99,999/100,000) x (99,998/100,000) The probability of exactly one of population members A, B, and C being in a sample of 100, drawn randomly from a population of 100,000, is equal to 0.00299970 or approximately 0.003.This is an example of the binomial probability formula which is used to calculate the chance of a certain number of successes in a given number of trials. In this example, the population members A, B, and C represent the successes and the 100 randomly selected sample of 100,000 is the number of trials.To learn more about the binomial probability formula refer to:
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TEXT ANSWER
A dog weighs 45 pounds 12 ounces. How much does the dog weigh in kilograms?
If needed, round your answer to the nearest hundredth.
Conversion ratios:
• 1 lb = 16 oz
1 kg = 2.2 lb
Use the equation editor to show your work.
.
Answer:
20,45 kg,
Step-by-step explanation:
45 Lb * (1 kg / 2,2 Lb) + (12 Austrália * (1 kg / 35 ,2 Austrália)) = 20,45 kg
Um resposta é 20,45 kg.
As of summer 2020, Voyager 1 is about 13.8 billion miles from Earth. Express this distance in AU,
using scientific notation, with two significant figures.
Answer:
1.478 x 10^2 AU
Step-by-step explanation:
To convert this distance to astronomical units (AU), we can use the fact that 1 AU is approximately equal to 93 million miles.
So, 13.8 billion miles is approximately:
13.8 billion miles / 93 million miles/AU = 147.8 AU
In scientific notation, this distance would be written as: 1.478 x 10^2 AU
during the winter season, a prominent newspaper reporter is interested in writing a story about the lack of proper heating of apartment buildings in the city in which he lives. during a particularly frigid weekend, this reporter manages to interview almost everyone in his own apartment building. the reporter finds that everyone, including himself, is satisfied with the heating in the apartment building. identify the type of sampling used in this example. a) Cluster sampling b) Convenience sampling c) Voluntary response sampling d) Systematic sampling 1 e) Attempted census
The type of sampling used in this example is Convenience sampling.
Convenience sampling is a type of non-probability sampling in which the sample is selected based on the ease of access or availability of the subjects. The sample is selected based on the researcher's convenience, and it does not use a random selection process.
In this case, the reporter chose to interview people in his own apartment building because it was convenient for him and he had easy access to them.
The other options you listed are:
a) Cluster sampling, which is a form of probability sampling in which the sample is selected by first dividing the population into smaller groups or clusters, and then selecting a random sample of those clusters.
b) Voluntary response sampling, which is a type of non-probability sampling where individuals choose to participate in the study.
c) Systematic sampling, which is a form of probability sampling in which the sample is selected by choosing a random starting point and then selecting every nth subject from the population.
d) Attempted census, which is when the researcher tries to include all members of a population in the sample.
Therefore, The type of sampling used in this example is Convenience sampling.
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Need to know answer to question !
the fourth one. I know it is correct, you may look it up on the desmos graphing calculator if you have suspicion it is not.
Write this in exponential form
5^2 x 5^6
Find the value for the following determinant
Answer:
42
Step-by-step explanation:
determinant of matrix
= 5(2) - 8(-4)
= 10 - (-32)
= 10 + 32
= 42
Answer:
32
Step-by-step explanation:
the determinant of matrix
[tex]\left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right][/tex] = ad - bc
then
[tex]\left[\begin{array}{ccc}5&-4\\8&2\\\end{array}\right][/tex]
= (5 × 2) - (- 4 × 8) = 10 - (- 32) = 10 + 32 = 42
fraction numerator dover denominator d x end fraction open square brackets in parentheses 4 x minus 7 close parentheses to the power of 4 open parentheses 7 x plus 8 close parentheses to the power of 5 close square brackets.
Differentiating the expression [tex]\frac{d}{dx} [(4x-7)^4(7x+8)^5 ][/tex] with respect to x will be [tex]16(4x-7)^3(7x+8)^5 + 35(4x-7)^4(7x+8)^4[/tex]
We are given with
[tex]\frac{d}{dx} [(4x-7)^4(7x+8)^5 ][/tex]
Here we will be using the chain rule. According to the chain rule, we will first have to solve the parentheses as a variable. Then we will have to solve the expression within the parenthesis
First, we will differentiate [tex](4x-7)^4[/tex] keeping [tex](7x+8)^5[/tex] constant. Here we will first assume [tex](4x-7)[/tex] as one variable and differentiate using the formula d/dx[x^n] then we will differentiate 4x - 7 to get just 4. They would be multiplied by one another
Hence we get
[tex]4 X4(4x-7)^3(7x+8)^5[/tex]
[tex]16(4x-7)^3(7x+8)^5[/tex]
Now, we will keep [tex](4x-7)^4[/tex] constant and differentiate [tex](7x+8)^5[/tex] and adding it up we get
[tex]16(4x-7)^3(7x+8)^5 + 5X7(4x-7)^4(7x+8)^4[/tex]
[tex]= 16(4x-7)^3(7x+8)^5 + 35(4x-7)^4(7x+8)^4[/tex]
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Complete Question
[tex]\frac{d}{dx} [(4x-7)^4(7x+8)^5 ][/tex]