is saying i've been blocked when all I did was copy and paste this: Which equations support the fact that rational numbers are closed under addition?

Select each correct answer.

13+13=23

6√+(−6√)=0

2√+2√=22√

9√+9√=29√

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