Help! What does z equal??

z = -35

Step-by-step explanation:

2/7z = -10divide both sides by 7/2

7/2(2/7)z = (-10)7/2

z = -70/2

z = -35

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

about 0.75 hours

step-by-step explanation: