Charlie does the following problem: 3 3 • 3 2 = 3 6 = 3 • 3 • 3 • 3 • 3 • 3 = 729. which of the following is a true statement? a he is incorrect because he should have 6 factors of 9. b he is incorrect because he should have only 5 factors of 3. c he is incorrect because he should have 3 factors of 6. d he is correct.

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?