Please help me. Its for a 100%

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

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?