I need help ;-; 20 points

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

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?

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?