Which choice is equivalent to the expression below?

The choice is equivalent to the expression  ⇒ A

Step-by-step explanation:

Let us revise some rules of exponents

Remember 1.23 can be written as 1 + +

∵ The expression is

- Write the exponent as a sum of its digits

∵ 6.38 = 6 + +

∴ The expression can be written as

- We can change the adding of exponents to the product of the

    same base as the 1st rule above product

∴    =

∴    =

The choice is equivalent to the expression

m a t h w a y. c o m

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