What’s the answer and work for this please someone tel me

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

What is the value of the expression below? 148+(-6)| + |– 35= 7|

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