Janell wants to replace the glass in her mirrors. She can buy glass for $0.89 per square inch. If the price includes tax, how much would she pay, to the nearest penny? The diameter or length of the mirror is 18 inches. Find the total cost for Janell to repair her mirror to the nearest penny. A) 226.36 B)132.35 C)335.65 D) None of the above

none of the above

Step-by-step explanation:

0.89 times 18 = $16.02

12cm

the answer is d

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204