If cos 330/2 = sqrt(3)/2 then
Prove that:
cos 165° = - sqrt(3) - 1 / 2sqrt(2)

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

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

3x + 4y = 5 x- 3y = -7 solve by substitution