exam Maths Puzzle Numerical Ability

I need to slove by completing the square
m^2-1/2 m=7/2

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This is not in the textbook and I would like to have an answer in the next 20 minutes to this problem: What is the x,y intercept, what is the domain and range, and is this a horizo The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 23 minutes requires 4.6 gallons of water. Find the amount of water used in a shower lasting 4 minutes.