Planks cost $3 each and plywood sheets cost $5 each. nick purchased 9 planks and 2 sheets of plywood. how much money did nick spend all together? explain how you solved the problem.

So if nick purchased 9 planks and they cost 3$ each then you could add 3 nine times or multiply 3x9 which is 27$
now the same with the plywood but i would be 10$ he spent on those
now add 27 to 10 and you get 37$ 
so he spent 37$ all together

Add up all the sides

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