Alot of points for those that understand this math and can help me with a few more :)!

Find the sum to the equation 3+6+9+

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+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.