exam Maths Puzzle Numerical Ability

Given: (triangle) EFG is a right traingle
(angle) G is a right angle
Prove: mesure of angle E < 90

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exam Other Question

Translate statement into algebriac equation. Let X represent the number, 12 less than 5 a number is 18.

Is this the correct anwer? (12 - 5)= 18

Thanks so much for you help! Another problem I'm having troubles with is:
perform the indicated operation and simplify:

1- 2x-1 over x^2-4 over or divided by 1+ 1/x-2

Translation:
1- 2x-1 divided by x