Question

Davis has $5.40 in his bank account on his fourth birthday. If his parents add $0.40 to his bank account every week, when will he have enough to buy the new Smokin' Derby race car set which retails for $24.99

Answer 1

49

Explanation:

Answer 2

49 weeks

Explanation:

y = mx + b

y is the total amount saved

x is the number of weeks

24.99 = .4x + 5.40 Solve for the number of months Subtract 5.40 from both sides

24.99 - 5.40 = .4x + 5.40 -5.40

19.59 = .4x Divide both sides by .4

`(15.99)/(.4)` =
`(.4x)/(.4)`

48.975 = x

We cannot have 48.975 week, so at 49 weeks Davis will have enough money.