I'm not the greatest with math but the first one is simple enough!

47.96 (total charged)

31 (base rate for 1 day rental)

47.96 - 31 = 16.96

16.96 / .16 = 106 ; therefore, Juan drove 106 miles. The Answer is B.

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For the second question....

M(x) is mosquitos, in millions

x is rainfall in inches.

So from here, it's just plug-and-play:

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A) M(x) = 18.0 x (9.0) - 9.0^2 [squared]

M(x) = 162 - 81

First option is... M(x)=81

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B) M(x) = 18.0 x (18.0) - 18.0^2 [squared]

M(x) = 324 - 324 = 0

Second option is... M(x) = 0

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C) M(x) = 18.0 x (324.0) - 324.0^2 [squared]

M(x) = 5,832 - 104,976 = -99,144

Third option is... M(x)= -99,144

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D) M(x) = 18.0 x (0.0) - 0.0^2 [squared]

M(x) = 0 - 0 = 0

Last option is... M(x) = 0

If I've worked through this second equation correctly the answer to the second problem will be A

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