Need Help! Please Due later tonight at 11:59 :))

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Sara has 2 2/3 cup taco meat. she needs 1/6 cup to make one taco. how many tacos can sara make with the taco meat she has?

Tanyss's house has 25 windows. her brother has washed 22 of the windows. what percent of the windows has her brother washed?