exam Maths Puzzle Numerical Ability

Please help me with the following question:

Evaluate ,- sqrt 4, if possible.


Find the length x, express in simplified radical form

51 is the length at the top
45 is at

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exam Other Question
Jose rode his trail bike for 10miles. Two-thirds of the distance was over a mountain trail. How long was the mountain trail? How do I rewrite the equation -8x-5y=-45 as a function of x?