A sofa is on sale for $258.40 which is 34%of the regular price. What was the regular price?

$391.52

Step-by-step explanation:

The original price was 100% of the original price.

Since it was sold at 34% off, then since 100% - 34% = 66%, it was sold for 66% of the original price.

Let the original price = x.

66% of x = $258.40

0.66x = 258.4

x = 258.4/0.66

x = 391.52

$391.52

answear:

a

step-by-step explanation: a

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