(look at the image) can i get help on this?

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

Human body temperatures have a mean of 98.20° f and a standard deviation of 0.62°. sally's temperature can be described by z = 1.4. what is her temperature? round your answer to the nearest hundredth. 99.07°f 97.33°f 99.60°f 100.45°f

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30