Can someone please help me with this?!?!!

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

Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?