What is the least number of 4 foot length of wood the carpenter can buy and still make all 69 dowels

Ineed to learn how to solve this problem

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?

Describe a situation where it would be beneficial to round decimals to the nearest dollar. explain why you would use rounding in that situation.