Question

For a recently released movie, the function y=119.67(0.61)x models the revenue earned, y in millions of dollars each week, x for several weeks after its release. based on the equation how much more money , in millions of dollars, was earned in revenue for week 3 than for week 5

Answer 1

$f(x)=119.67(0.61)x$

substitute three in to get 

$f(3)=119.67(0.61)(3)$ 

which simplifies to 218.996.

week five is 

$f(5)=119.67(0.61)(5)$

which simplifies to 364.9935

you can then find the difference which shows that week five earned $146.00 more than week three