There is a pattern (2,4) (4,6) (6,9) (8,12) what is the 8th group

Find the value of the cosine for angle a

What does x = in this equation x+3+2x=x+5

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