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Answer:
Step-by-step explanation:
Look at the term:
"y is seven times the value of x."
This term means that whatever x is, y is always going to be 7 times greater than that number. Meaning that x needs to always be multiplied by 7 to get y, easy.
Make 7 the coefficient.
The average value of 
over the given interval is
You're given five points, but only four will contribute to the sum as there are four subintervals that you can work with. Because you are finding the right-endpoint approximation, the height of the rectangles used in the Riemann sum will be determined by the points
, where the height of each rectangle is the corresponding value of and the width is the length of the subinterval. In this case, the lengths would be (left to right and respectively) 
, which is simply the set of forward differences of the previous set.
So the average value is approximated by
You're given five points, but only four will contribute to the sum as there are four subintervals that you can work with. Because you are finding the right-endpoint approximation, the height of the rectangles used in the Riemann sum will be determined by the points
So the average value is approximated by