exam Maths Puzzle Numerical Ability

please help me with finding the equation of the line with a slope of -1/2 that passes through (2,-4). State in slope intercept form.

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exam Other Question

(rs) radical sign

Is (rs)38 a rational or irrational number?
I think it is irrational because it is not a perfect square. what is a quotient of a monomial and a polynimial