7(y+2x)-3(y-x) expand and then simplify the expression.

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.

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?