Question

You own two restaurants. From 1995 to 2000, the sales R1 (in thousands of dollars) for one restaurant can be modeled by:

R1 = 480 – 8t – 0.8t2, t = 0, 1, 2, 3, 4, 5, where t = 0 represents 1995.

During the same 6-year period, the sales R2 (in thousands of dollars) for the other restaurant can be modeled by:

R2 = 254 + 0.78t, t = 0, 1, 2, 3, 4, 5

Write a function R3 that represents the total sales for the two restaurants.

Answer 1

Assuming you meant:
480 - 8t - .8t^2 or R1

sub in all the values of t into R1, then add them up

sub in all the values of t into R2, then add them up

compare the two answers.