Solve ax − by = f for x. a. x equals quantity f minus b times y divided by a b. x equals quantity f plus b times y divided by a c. x = a(f − by) d. x = a(f + by)

Your answer is B

The parent function is ax - by = f
So add by to f and you'll get f + by
Then that leaves ax = f + by
You're trying to find x so you divide the f + by and a  and your outcome is
 (f +by) 
Your final answer is x = (f +by) 

Hope this helps! Just ask if you're confused on what I did.

The density of the cube is 40

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