Which terms in the expression are like terms?

1/2a + (- 3a) - 3b - 0.7a

chose all that are correct

a. 1/2a

b. - 3a

c. 3b

d. - 0.7a

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

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

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account