exam Maths Puzzle Numerical Ability

Solve

square root of 2y+7 +4=y

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exam Other Question

Determine if the following are solutions to the inequality...
-1, 1, 6, 13

x - 3>_6 (the _ is supposed to be inderneath the >)

Can someone please help me, I do not understand how to do these at all.
9 1/2 +16 1/2