The square of a number is 12 less than 7 times the number. What is the number?
-4 or-3
-4 or 3
-3 or 4
3 or 4

D. 3 or 4

Step-by-step explanation:

Just took it. Got it right. Edg 2020. Hope this helps :)

seems like d

step-by-step explanation:

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