divide the price paid by the original price:
40 / 80 = 0.5
Multiply that by 100 for the percent:
0.5 x 100 = 50%
They paid 50% of the original price.
Domain: xER\{-5,7} I’m pretty sure
This is the answer to the question
1) (x+1)(x+1) so the vertex is (-1, -1)
2) complete the square so the vertex is (1/2, -1/4)
3) 2(x+0)^2 + 5 so the vertex is (0,5)