What is 0.5 of 36? 5,18,36,72

You serve 3 1/4 gallons of punch at a party. your friends drink 1 1 /2 gallons of the punch. which of these containers is the smallest you can use to store the remaining punch?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /