Which expressions are equivalent to 7⋅7⋅7⋅7⋅7⋅7
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It's FROM KHAN academy

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b

Plzzz answer both questions and i will give you 100 points