Using polyfit and polyval built-in function find out 'y' for the corresponding value of x-6, of the coordinates (3, 10), (7, 20), and (10, 30). consider first order polynomial. also write the equation of the polynomial. hints: pn-polyfit(x, y, n), where n is the degree/order of polynomial yspolyval x), y is the interpolated value of corresponding x of that polynomial

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?