book Maths Puzzle Numerical Ability

an earthquake was felt throughout a circular area of 1,808.64 square miles. what is the radius of the circular area?
a- 24 miles
b- 576 miles
c- 12 miles
d- 20 miles

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book Other Question
How do you find the domain for a question like y = one over x + 2 (((((((Find the rationalroots of f. List any irrational roots correct to two decimal places f(x)=x^4-3x^3-4x^2=18x-12))))))))