Pls help on all of them I’m confused

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

Does the point (1, sqrt 7) lie on circle shown.

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept