Solve for a and b. 40 30 5

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

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?