The sweater shack is offering a 20% discount on sweaters. if the regular price of a sweater is 15.00 dollars what is the discount

The discount is $3.00 Why?  You need to multiply the cost of the sweater by the discount as follows:

15x0.2=3

the balance is found at the link

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