A grocery store finds that the number of boxes of a new serial sold increases each week. In the first week, only 20 boxes of the serial were sold. In the second week, 53 boxes of cereal or sold and then the third week 86 boxes of cereal or sold. The number of boxes of cereal so each week represents an arithmetic sequence. What is the explicit rules for the arithmetic sequence that defines the number of boxes of cereal sold in week n? Use this rule to calculate how many boxes of cereal will be sold during the seventh week show all work

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?