Answer:
- a) f(x) = - 20x + 450
- b) 30 pages left to read
Step-by-step explanation:
Given sequence:
The first term is 430 and the common difference is - 20.
a)
Required function is:
- f(x) = 430 - 20Ix - 1) = 430 - 20x + 20 = 450 - 20x
or
b)
Find the number of pages left after 21 days:
- f(21) = 450 - 20*21 = 450 - 420 = 30
