CDs costs $4 each and DVD cost $8 each.
1 answer:
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Answer:
(x) =
Step-by-step explanation:
let y = f(x) and rearrange making x the subject, that is
y = 5x + 4 ( subtract 4 from both sides )
y - 4 = 5x ( divide both sides by 5 )
= x
change x to (x) and y back to x, thus
(x) =
Answer:
The answer is "140".
Step-by-step explanation:
Calculating the average cost:
To minimize average cost we have to find x for wich A'(x)=0