How much water should be added to 10ml of 7% alcohol solution to reduce the concentration to 5%

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

Is a positive integer raised to a negative power always positive