I'll do the first three parts (h, i, j) to get you started
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Part h
sqrt(50) = sqrt(25*2)
sqrt(50) = sqrt(25)*sqrt(2)
sqrt(50) = 5*sqrt(2)
You had the right idea, but you needed to keep going to simplify sqrt(25) into 5
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Part i
sqrt(24) = sqrt(4*6)
sqrt(24) = sqrt(4)*sqrt(6)
sqrt(24) = 2*sqrt(6)
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Part j
sqrt(40) = sqrt(4*10)
sqrt(40) = sqrt(4)*sqrt(10)
sqrt(40) = 2*sqrt(10)
