Ireally need does anybody know the answer?

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

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41