exam Maths Puzzle Numerical Ability

Express this statement in terms of an inequality involving absolute value.

The cruise control of a car set at 55mph should keep the speed s within 3mph of 55mph.

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Tutor,

Could you please tell me if I have this answer correct?

Write the equation of the line that passes through point (0,7) with a slope of 2. Is the answer... y=2x + 7?

Thanks. Twice the area of a square is 72 square miles. What is the length of each side of square?