Question

Suppose f(x)=x^2 -4x million dollars are earned, where x is the number of years after 2005.
a)What is f(20) answer is that it equals 320
b) The answer to part (a) gives the number of millions of dollars earned for what year?

Answer 1

whr r u stuck

Answer 2

I don't understand how to get the answer for b

Answer 3

x is the number of years after 2005.

so, 2005 + 20

Answer 4

ok