Each front tire on a particular type of vehicle is supposed to be lled to a pressure of 26 psi. Suppose the actual air pressure in each tire is a random variable X for the right tire and Y for the left tire, with joint pdf f (x,y) =(k(x2 + y2),20 x 30,20 y 30 0, elsewhere (a) What is the value of k? (b) What is the probability that the dierence in air pressure between the two tires is at most 2 psi?

part B please