Well, honey, to make 15 using only the number 4, you can do 4 + 4 + 4 + 4 + 4 - 4 = 15. It's not rocket science, just basic math. So go ahead and impress your friends with your newfound arithmetic skills.
if your using whole numbers, u can only use 3
4 * 4 - 4 / 4 = 15
4!+4+4/4
how do i make 17 using only 2 4 6 8
11