exam Maths Puzzle Numerical Ability

Light travels approximately 5.87 x 10^12 mi. in one year. This distance is called a light-year. Suppose a star is 2 x 10^4 light-years away. How many miles away is the star?

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Please help w/ the following:

2x^-2+3x^-1+1=0

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kwasi thought of a number,multiplied it by 3whole number 1 over 2 and added 16 to the result.if the final answer was 30,what number did he think of?