-28=-5x+7

Solve the two step equation

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.