Which subtraction expression
has the difference 1 + 4/?
o (-2+61) – (1 – 21)
(-2 + 61) – (-1 – 21)
(3 + 51) – (2 - 1)
(3+51) - (2 + 1)

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?