14) The temperature at dawn was -5 F .By noon the temperature had risen 20 degrees F. What was the temperature at noon?

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

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

Billy plotted −3 4 and −1 4 on a number line to determine that −3 4 is smaller than −1 4 is he correct? explain why or why not?