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Verified answer

7.
1) √5 + √5 = 2√5 = √(4*5) = √20
    √20 = √20

2) √18 + √8 = √(9*2) + √(4*2) = 3√2 + 2√2 = 5√2 =
    =√(25*2) = √50
    √50 < √54

3) √63 + √28 = √(9*7) + √(4*7) =3√7 + 2√7 = 5√7 =
    = √(25*7) = √175
   √175 > √168