Question

Boris wants to save $500 to buy a TV. He saves $19 each week. The amount, A (in dollars), that he still needs after w weeks is given by the following function.

A (w) = 500-19w
Answer the following questions.
(a) If Boris still needs $139, how many weeks has he been saving?
weeks
(b) How much money does Boris still need after 5 weeks?
$0

Answer 1

a) 19 weeks

b) $405.00

Explanation:

a

139 = 500 - 19w Subtract 500 from both sides

139 - 500 = 500 - 500 - 19 w

-361 = -19w Divide both sides by -19

`(-361)/(-19)` =
`(-19w)/(-19)`

19 = w

b

A(5) = 500 - 19(5)

A(5) = 500 - 95

A(5) = 405