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The local skating rink pays Mary a fixed rate per pupil plus a base amount to work as a skating instructor. She ears
$90 for instructing 15 students on Monday afternoon. Last Friday, she earned $62 for working with 8 students. Lisa is
also a skating instructor. She receives half the base amount that Mary does, but she is paid twice as much per
student. Who would earn more money instructing a class of 20 students?
O Lisa would earn $120 more than Mary
O Lisa would eam $65 more than Mary.
O Mary would eam $15 more than Lisa
O Mary would earn $10 more than Lisa.
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The expressions for the payment made to Mary are,

(Monday) 90 = 15m + b

(Tuesday) 62 = 8m + b

where m and b are the fee per student and the base fee, respectively. Solving for m and b, the values are 4 and 30.

The equation that represents Mary's earning is

y = 4x + 30

For 20 students,

y = 4(20) + 30 = 110

For Lisa's earnings,

y = 8x + 15

Substituting 20,

y =8(20) + 15 = 175

Thus, Lisa would earn more than Mary by $65.

(Btw this is not my work, I got it from someone else on and wanted to help lol)

answer: 140

step-by-step explanation:

so just add all then it will be your answer but i am not pretty sur eif it is but hope this i am here to people

the correct answer is b. negative exponential growth.

step-by-step explanation:

you can tell it's an exponential function because it decreases rapidly then levels out and never touches the x-axis.

it is negative because the y-axis decreases as the x-axis increases.

therefore it is a negative exponential growth graph.

hope i !