Which expressions equal zero? A) -52 + 52

B) 12 +(-1

C) 6-(-6)

D) -27 +(-27)

E) -83 -(-83)

A and E

Step-by-step explanation:

because b is 13 c is 12 and d is -54

A,B,E

Step-by-step explanation:

I checked on the usa test prep and its what those three

do you mean add both of the equations together

because if you do the answer is 10x-5

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