Question

6

Answer 1

you are correct

Answer 2

because w represents the number of weeks
f(w) = 10w + 8

so week 1 : f(1) = 10(1) + 8 = 10 + 8 = 18
week 2 : f(2) = 10(2) + 8 = 20 + 8 = 28
and so on...