$12.50
because he spent half of what he had left on notebooks and paper wicth left him with $5 so you multiply 5×2=10 to get you what he had before he spent half 9f his money. Then add to $2.50 to get what he had in total
3/10
First find the common denominator= 10
Then subtract 5/10 from 8/10 which gives you 3/10 of an hour he played basketball
I think the advertisements and sales can trick you or be false when you are shopping.
I am not really sure but I hope this helps!
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