Estimate the difference between the population of Phoenix in 1990 and 2012 given the rate of change of the population of Phoenix, Arizona, is modeled by the exponential function P' (t)= 8.6-0015 where t is the number of years since 1960 and is in thousands of people per year.

answer: a) (0,0), (1,1), (2,8), and (3,27).

step-by-step explanation:

0^3=0

1^3=1

2^3=8

3^3=27

in effect, the exponential equation for this would me y=3^x. each x-coordinate cubed is giving the y coordinate, so a is your answer : )

b

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.