Which of the following quadratic equations has the solution set {−20,9}?

A. x^2 - 9x + 20 = 0
B. x^2 - 11x + 180 = 0
C. x^2 + 11x - 180 = 0
D. (x + 20) (x - 9) = 0
E. (x - 20) (x + 9) = 0
F. (x - 5) (x - 4) = 0

Organic apples are on special for $1.50 per pound. does total cost vary inversely or directly with the number of pounds purchased? find the cost of 3.4 pounds of apples. a. inversely: $5.10 b. directly; $5.10 c. inversely: $2.27 d. directly; $2.27

Which choice has the correct steps in graphing the solution set to the following inequality? -45_> 20x-5y

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.