exam Maths Puzzle Numerical Ability

Could someone please help me I forgot how you get the area of a square.
side 1 sqrt3 + sqrt3
side 2 sqrt3 + sqrt3

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exam Other Question

5-(-6)
slope= 11/5
3-(-2) One number is 18 more than another,and the sum of the smaller number and twice the larger number is 45. Find the two numbers and solve the equation.

Someone please help!!!!!