exam Maths Puzzle Numerical Ability

Michael rows 8 mph in still water. If he rows 24 miles downstream in the same amount of time he rows 8 miles upstream, find the rate of the current.

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1. Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of the function in each case.
1. Painting: A cylindrical tank has a radius of 6.5 ft. and an altitude of 14 ft. If a gallon of paint will cover 120 ft^2 of surface, how much paint is needed to put two coats of