If x + y = -10 and x - y = 2, what is the value of x?

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

What is the area of the triangle 10 13 12

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