Answer:
D. 75(5r+3d+4f) and 75(5r)+75(3d)+75(4f)

The answer is above.
Additional note 1:

Additional note 2:
In the answer I filled in "0" at the place where "n" was. This is because the question tells us n=0
Solve for x by cross multiplying and the answer is x=6
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Since the diameter of the cylinder is 10, its radius is half that, or 5, thus
Answer:
Kayla sold 90 boxes of cookies.
Step-by-step explanation:
let's have X be the number of boxes Kayla sold.
x⇒100%
18⇒20%
Find x,
x=100/20 × 18
x=90