What is the surface area of sphere with a radius of 7?

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.