Artie's dad's house is 21 ft tall. if artie's dad is at the top of the house installing shingles, and his son artie is on the ground 12 ft away from the base of his dad's house, what is the angle of depression from the top of the house to the spot where artie is standing?
a. 46.56
b. 60.26
c. 161.62
d. 11.65

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?