Solve. A contractor estimates it will cost $2,400 to build a deck to a customer's specifications. How much will it cost to build five similar decks? Cross products! Help me how to do it?

Question

anonymous · Answer

$12000

helpmemath · Answer

How did you get that though? Can you draw it step by step?

anonymous · Answer

okay so it says that it costs about $2,400 to build one deck. And to make 5 more similar decks you just multiply it by 5. So, $2,400*5 = $12000

helpmemath · Answer

I have to do cross products though. I understand what you're saying but I don't really understand what numbers to put. I have to show my work or it counts wrong.

anonymous · Answer

Well i am not really good with vectors

helpmemath · Answer

Thanks anyway :)
Google was my second choice for this problem :P