Discover Questions

Five less than double a number is thirteen? For any non-empty set S, which number belongs to natural number?
a. nP(S)/4
b.nP(S)/3
c.nP(S)/2
d.nP(S)/2^3? URGENT! Math help please!!? How strong is 0.5 mg. in medicine the least or the most? How would I write 5x - 2Y = 8 in function form? An explanation of how to get there would be huge.?