The tax on a purchase of $20 is 1.12. how much will tax be on a purchase of $45.50

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

W-16=-12 solve each one step equation plz

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?