book Maths Puzzle Numerical Ability

How do you find the domain for a question like y = one over x + 2

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Find the quotient or product and show work!

(x-6)(2x+3)
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