The scatter plot shows the time spent watching TV, x, and the time spent doing homework, y, by each of 23 students last week. (a) What is the predicted time spent doing homework for a student who doesn't spend any time watching TV?
(b) For an increase of one hour in the time spent watching TV, what is the predicted decrease in the time spent doing homework?
(c) What is the predicted time spent doing homework for a student who spends hours watching TV?

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?