5hundreds x 10 unit & standard form

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

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

In angle pqr find the measure of