Question

The revenue R in dollars received from selling x radios is R(x)=x(90-x). What number of radios sold will maximize revenue? What is the maximum revenue?

Answer 1

help me please

Answer 2

multiply this out and get
\[R(x)=90x-x^2\]
then the minimum will be at the vertex
first coordinate of the vertex is \(-\frac{b}{2a}\) which in your case is \(-\frac{90}{2\times (-1)}=45\)

Answer 3

oops i wrote "minimum" i meant "maximum" sorry

Answer 4

45 is the maximum revenue right? so what would be the answer to the other question?

Answer 5

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