Vince is trying to fit two boxes into the trunk of his car. One box is 1/2 of a foot tall and the other is 2 4/5 feet tall. Stacked on top of each other, what is the combined height of the two boxes? Write your answer as a fraction or as a whole or mixed number.
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The combined height of the two boxes is 39.6 inches.  or 3 3/10 feet

Step-by-step explanation:

1/2 foot = 6 inches

2 4/5 feet = 33.6 inches

32 + 6 = 39.6 inches

38 / 12 = 3.3 ft = 39.6 in

3 ft 3/10 in

= 3 3/10

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