exam Maths Puzzle Numerical Ability

Is the following trinomial a perfect square?
x^2 - 14x + 49

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exam Other Question

Find the length, slope, midpoint and equation to the line
PQ.

P (7, 11)
Q(-2,4)
An alloy of tin is 16% tin. How much tin must be added to make 820 lbs of alloy that is 18% tin? Answer to the nearest tenth.