which of the following equations represents a parabola that opens up and has a vertex with a positive x-value?
a. y=-x^2+8x-15
b. y=2x^2-16x+38
c. y=2x^2+16x+24
d. y=-4x^2-14x-12

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Which statement justifies why angle ebc measures 90?