Lena buys 12 cans of soft drinks and 11 sandwiches for a picnic. Patrick buys 10 cans of soft drinks and 7 sandwiches for the sa
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This is equivalent to finding a function g in which 
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We simply reverse the actions of the initial function by adding 81 back and taking the square root. Therefore,
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We simply reverse the actions of the initial function by adding 81 back and taking the square root. Therefore,