1.Simplify ( x +1)(x- 1) + 2x ² 2. Simplify (x + 2)(x - 1) -2(x + 1)
3. If 45 is added to a certain number and the result is divided by 9 ,the quotient is 8. What is the number?

Please help

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?