book Maths Puzzle Numerical Ability

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Using the index of a sequence as the domain and the value of the sequence as the range, is a sequence a function?

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the inlet pipe of an oil tank can fill the tank in 1 hour 30 minutes. the outlet pipe can empty the tank in 1 hour. find how long it takes to empty a full tank if both pipes are How do you find an equation if all you know is m= -7/5 and the x intercept is 5?