Find the values of x and y. Please explain how you got your answer

(i won't be clicking on anything that looks sketchy)

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m