exam Maths Puzzle Numerical Ability

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.

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Please help me on this problem. Many Thanks.

Theo has $5 more than Denise and Denise has $11 more than Rudy. Together they have $45. How much money does each have? Find the perimeter of a rectangle whose area is 22 square meters and whose diagonal is 10 meters.