20. –3 |z| + 2(a + y) what's the answer? z=-4.2 a=-2 y=3

What is the equation and solution for the sentence? the sum of a number and thirty-one is one hundred thirteen. write the equation as n-31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and add 31 to both sides. the answer is 144. write the equation as n-31=113 and add 31 to both sides. the answer is 144.

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

Which expression shows the sum of the polynomials with like terms grouped together