The population of a certain city is given by the function , where x is years since 2000 and the population is measured in thousands of people a) Find the average rate of change in the population between the years of 2000 and 2018.

b) Find the instantaneous rate of change in population in the year 2018 and interpret this answer.

step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15