The joint PDF is:
f(x,y)= c(x^2 + y^2) for o<_ y <_ 1-x^2
I found c to be 5/4 which I know is correct from the back of the book.
Now I need to find Pr(Y<_ x+1)
I know the answer is 13/16 but I can't figure out how. I am doing a double integral...x from -1 to 1 and y from 0 to x+1 of 5/4 (x^2 + y). But this is not giving me 13/16
Anyone know where my error is? Help! Thanks!