Find the perimeter of a rectangle whose length is 18 m and breadth is 5 m

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

Solve the system of equations. y= 2x y= x^2 - 15

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.