Question

Help anyone? Medal reward(:

At Yvonne's Auto Detailing, car washes cost $5 for any time up to 10 minutes, plus $.40 per min after that. The managers at Yvonne's are trying to agree on a formula for calculating the cost c for a t-minute car wash.

a. Sid thinks c=0.4t+5 is correct, is he right?
b. Tina proposes the formula c=0.4(t-10) + 5. Is she right?
c. Jamal says Tina's formula could be simplified to c=0.4t+1, is he correct?

Answer 1

no, yes, no

Answer 2

How come @L00pz

Answer 3

First one is incorrect because let's say he worked one minute, then it will be more than five bucks with that equation.

2nd is not correct because you may end up with a negative answer. (sorry, i meant no)

3rd has no correlation with the problem whatsoever. Say he worked 1 minute as well, one dollar will not suffice for anything.

Answer 4

Hope I answered your question buddy!

Answer 5

Thanks!