book Maths Puzzle Numerical Ability

Find the domain of:
f(x)= x/xsquared+3x-4

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book Other Question

Algebraically show whether the point M(2,-3) is on the line defined by
3x - 6y + 1 = 0

Can i please get some help with this question? An outboard motor calls for a fuel mixture that has a gasoline-to-oil ratio of 50 to 1. How many pints of oil should be added to 6 gallons of gasoline?