exam Maths Puzzle Numerical Ability

When you do Inequalities how do you graph them on a number line

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exam Other Question

What geometric postulate justifies the statement below :

If AB is congruent to CD and CD is congruent to EF, then AB is congruent to EF. If f(x) = x^2, find f(8-square root 5)
=(8-sq. root 5)(8- sq. root 5)
=8^2-8(sq. root 5)-8(sq. root 5)+(sq. root 5)^2
=64-16 sq. root 5+5
=64+5-16 sq. root 5
=69-16 square root 5