E and F are independent with P(E)=0.35 and P(F)=0.45. P(E union F)=___.

ok this one I have some trouble with. P(E) - P(F) = 0.10 this is my answer is it right. this looks easy but hard for me. list of possible answers are.

1. 0.80

2. 0.10

3. 0.1575

d. 0.6425