What is the area of this triangle?
a.) a=1/2(y3-y2)(x3-x1)
b.) a=1/2(y3-y1)(x3-x1)
c.) a=1/2(y3-y1)(x2-x1)
d.) a=1/2(y2-y1)(x3-x1)
e.) a=1/2(y2-y1)(x2-x1)

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?