2(x + 3) = 18 please i need a valid answer I'm in 6th-grade pre-ap so this is seventh-grade math.

Atoy company is considering a cube or sphere-shaped container for packaging a new product. the height of the cube would equal the diameter of the sphere . compare the volume to surface area ratios of the containers. which packaging will be more efficient? for a sphere, sa =4πr²

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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)