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angeltmccoy1661
27.10.2020 •
Mathematics
At Yvonne's auto dealing, car washes cost $5 for any time up to 10 minutes, plus $ .40 per minute 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. Sid thinks c = 0.4t + 5 is correct. Is he correct?
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Ответ:
He is incorrect
Step-by-step explanation:
Here, given the charge at the auto dealing, we want to know if the formula the managers came up with is correct
The base fee is $5 for 10 minutes or less
Now for any extra minute after the tenth, $0.5 will be paid
So for a t-minute wash, the amount to be paid will be;
C = $5 + 0.4( t- 10) = 5 + 0.4t - 4 = 1 + 0.4t
If t < 10 , C = $5
If t > 10, C = 1 + 0.4t
Sid is incorrect
Ответ:
3y-5-(y-7)=
(3y-y)+(7-5)=2Y+2