exam Maths Puzzle Numerical Ability

Given: AB is equal to BC: D is the midpoint of segment AC PROVE: triangle ABD is equal to triangle CBD

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exam Other Question

Square root sign m and right beside it they have square root sign m^2 -23 <_ 4x -6 <_ -5
The solution is {xl?<_x<_?}
Will someone show me how to do this correctly? PLEASE??