exam Maths Puzzle Numerical Ability

Please help solve:
-2x+3y=-2
y=3x-3

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exam Other Question

#69 Find the interest on a $5000 bond that pays an annual percent rate of 61/2% for 6 years. 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