An electronics store sells an average of 60 entertainment systems per month at an

average of $800 more than the cost price.

For every $20 increase in the selling price,

the store sells one fewer system. What

amount over the cost price will maximize

profit?

if

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

the answer is the third / last answer

step-by-step explanation:

answer: b. f(x) = (x + 2)^3 (x^2 - 7x + 3)^4

step-by-step explanation:

polynomials always have as many roots as their order. this is a 4th order polynomial- hence 4 roots!

complex roots of polynomials always come in pairs. the quadratic equation has the "+/-" in that will alwaysgenerate m+ni amd m-ni, so 7-2i must be a root of this polynomial equation.

the order of the numerator and denominator are both 2. so the horizontal asymptote is y=a2/b2 =7

verticle asymptotes are the forbidden x-values. f(x) becomes undefined at x=-3 because this value will cause a zero denominator.

a graph of r(x) will have vertical asymptotes at ±1 because these values will make the denominator zero. so the domain of the function cannot include ±1.

you 're wlecome! : )

cretdit to source

your answer is -9

step-by-step explanation: