The wholesale price of 20 sweaters is $260. A clothing store sells each sweater for $17.55. What is the percent increase from the wholesale price of one sweater to the store's selling price of one sweater?\

Step-by-step explanation:

the price for the whole sale is 260/20=13

if the store is selling one sweater for 17.55

the percentage increase

17.55-13=4.55

4.55/13=0.35

0.35*100=35%

the increase was 35%

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this