Answer :
I think that the answer is 5 because the elements of U is {1,4,9,16,25,36,49,64,81,100} and that of V is {4,16,36,64,100}
The intersection will be {4,16,36,64,100} the number of elements are 5
The intersection will be {4,16,36,64,100} the number of elements are 5