Question

A store had 175 cell phones in the month of January. Every month 10% of the cell phones were sold and 10 new cell phones were stocked in the store.

Which recursive function best represents the number of cell phones in the store f(n) after n months?

f(n) = 175 - 0.9 • f(n - 1) + 10, f(0) = 175, n > 0

f(n) = 0.1 • f(n - 1) + 10, f(0) = 175, n > 0

f(n) = 175 + 0.9 • f(n - 1) + 10, f(0) = 175, n > 0

f(n) = 0.9 • f(n - 1) + 10, f(0) = 175, n > 0

Answer 1

@phi @SolomonZelman

Answer 2

Test each formula.

Answer 3

i think it is b.

Answer 4

im going to go with B.