Suppose that d(r) is a function which gives the population density, in hundreds of people per square mile, within r miles of the center of a very small town. assume that there are 100 people per square mile within 5 miles of the town’s center, and 350 people per square mile within 7 miles. a. let t(r) be the number of people (in hundreds) who live within r miles of the city. write an expression for t(r), in terms of r and d(r). b. what is the average rate of change of the function t (r) over the interval [5, 7]

a) T(r) = r.D(r)

b) 975 people per square mile.

Step-by-step explanation:

(a)

The units of D(r) are  

when multiplying the density by the area we get the amount of people in that area, so

(b)

The average rate of change of T(r) over the interval [5,7] is

but D(7) = 350 and D(5) = 100, so

and the average rate of change of T(r) over the interval [5,7] is 975 people per square mile.

55/i dont know i do it for the points

step-by-step explanation:

answer: yard ramps with a level off platform are typically 36 feet long. truck, rather than at an angle, enabling access to those pallets at the very back of the truck. if you are using your yard ramp to convert a loading dock into a drive-in door, we even at 60 inches (5 feet) high and a 30 foot ramp, the slope of the ramp will be less

step-by-step explanation: