Find all x that satisfy the given equation for 0<_x<2pi. Select all that apply. 2 cos^2x+cos x=0

If i have 20$ and i gave 5$ away how much i got

Which function has the domain x> -11?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible