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+ 2. Equations & Inequalities > 2.05 Practical problems with equations
1
Elleen's bathtub can be filled in 18 minutes and can subsequently be drained in 19 minutes when it is unplugged. Find the number of
minutes, n, that it will it take to fill the bathtub if it is left unplugged while being filled.

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?