What is the simpler form of the expression? (3c^2 + 7)(3c^2 - 7)

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.

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

What is the value of x in the equation7x+2y=48 when y=3