$23 marked down by 15%. A. Equation where y is the amount of markdown, x is the original price and k is the markdown in decimal form.

B. Use the equation to find the amount of markdown .

Help meee

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

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20