To convert a mixed fraction into an improper fraction:

First off, Parallel lines are two lines that lie within the same plane and never intersect, So the undefined terms that are needed to define a parallel line are Lines, planes.
I think you forgot to mention Susan's current age if not:
x+5
x-4
6x
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➷ 40 = 1.8c + 32
Subtract 32 from both sides:
8 = 1.8c
Divide both sides by 1.8:
c = 4.4
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1 ft = 12 inches
(1 ft)^3 = (12 inches)^3
1 cubic foot = 1728 cubic inches
You'll multiply by the conversion factor (1278 in^3)/(1 ft^3) to convert from cubic feet to cubic inches. Notice how the cubic feet ft^3 unit is at the bottom of the conversion fraction, so that the cubic feet units cancel.
Answer: A) multiply by 1728