Which expression is a factor of 21x2 + 13x – 20? A. 3x – 4
B. 7x - 5
C. 7x + 4
D. 3x + 5

Anyone know? will mark brainliest if correct!

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 8 = -6x a. –7.12, 1.12 b. 7.12, –1.12 c. 7.12, 1.12 d. –7.12, –1.12

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need