Which of the following expressions is an equivalent factored form for the quadratic (4x^3+49x) (On picture number 3)

What is the expression in factored form? -x^2 + 3x + 28 a. (x-7)(x-4) b. -(x-7)(x+4) c. (x+4)(x+7) d. -(x-4)(x+7)

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?

Two numbers have a sum of -19. one number is x. what expression represents the other number?