25 is 25% of what number?

100

Step-by-step explanation:

We have, 25% × x = 25

or,

25

100

× x = 25

Multiplying both sides by 100 and dividing both sides by 25,

we have x = 25 ×

100

25

x = 100

If you are using a calculator, simply enter 25×100÷25, which will give you the answer.

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