exam Maths Puzzle Numerical Ability

find the domain of the rational expression
2x-1
x^2-16

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exam Other Question

walking to the store,you are 1/4 of the way, when you pass a clock that says 7:30. At 7:34 you are 1/3 to store. What time will you arrive at the store. Could you please help me figure this equation out?

{{{{ .32x^3 - 7.9x^2 + 100x - 15 = 33.045 }}}}

I have tried factoring but it seems unsuccessful. Thanks for your help!