Which expression gives the length of the transverse axis of the hyperbola shown below?

What are “like terms”? why can we only add like terms?

This is about circle theorems. someone asap : (

Two trains leave stations 546 miles apart at the same time and travel toward each other. one train travels at 95 miles per hour while the other travels at 115 miles per hour l. how long will it take for the two trains to meet