6+17=3y-10 what is the answer it is a multi-step equation

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

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.