exam Maths Puzzle Numerical Ability

what is the the square root of 28n squared?

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Hello,
I am stuck on a problem in my precalculus class. Any help would be greatly appreciated.

The current I, in amperes, flowing through a particular ac (alternating curre at sammys sub the cost of a regular sub sandwich is $5. sammyshas sunday sub special:$2.off every order. write an expressionthatrepresents the cost of an order of nregular sub sandwiches on sunday.