The horizontal line segment at the top of the polygon on the grid below is how many units long?

On a coordinate plane, points are at (3, 4), (3, -3), ( -3, -2), ( -3, 4).

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Solve 30% of what = 60 step by step

Which angle is the smallest? also give me an explanation so i can complete it to other questions as well, : )