If (r, s) is the solution to the system of equations, what is the value of r?

−8r − 8s = 100 r − 2s = 10

A) −5
B) − 15/2
C) 5
D) 15/2

C

Step-by-step explanation:

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134.6 us dollars

step-by-step explanation:

1 us dollar = 1.33 canadian dollars

so, 150 us dollars = 150 × 1.33 = $199.5.

in canada, the money mitchell spent = 20 canadian dollars.

remaining canadian dollars with him = 199.5 - 20 = 179.5.

after mitchell returned to us, he exchanged the remaining canadian dollars to us dollars.

179.5 canadian dollars = 179.5 × 0.75 = 134.6 us dollars.