math,correction plz

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can someone correct my math...thanks...

Perform the indicated multiplication. Then simplify each radical expression.
Problem#4
radical(13) times radical (5)

My answer: radical (15)

Problem #28

radical (7) (2radical(3)+3radical(7))
MY answer: 2radical(21) + 21



No on first one. sqrt(5*13).

yes on second.

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