Just answer one and make sure you arent answering one somebody else answered

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Evaluate cos2θ for cosθ = square root of 3/2

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.