exam Maths Puzzle Numerical Ability

f(x)=1/x-4x-5 find the domain of f(x)

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exam Other Question

A cyclist traveled at a rate of 24 mi/h to visit a nearby town . The cyclist averaged 18 mi/h on the return trip. If the round trip took 4.9 hours, find the one way distance to the nearby town.

Thanks A three piece suit costs exactly $100. No more no less. It has a vest, pants and a coat. The pants cost twice as much as the vest. The coat costs twice as much as the pants. How much does each piece cost.