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$32.23

Step-by-step explanation:

4($9.99) = $39.96

                 $39.96 - 39.96(0.20)

                 $39.96 - 7.992      =  $31.97 rounded to the nearest penny

                                                    $31.97 + 31.97(0.0675)

                                                    $31.07 + 2.16             = $32.23

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

$15.40 per mile

step-by-step explanation:

you have to round up to 4 because 6 is over 5 so you have to round the 3 up to 4