Awater well drilling rig has dug to a height of -60 feet after one full day of continuos use. assuming the rig drilled at a constant rate what was the height if the drill after 15 hours?

How do you solve a question like this?

Place the following steps in order to complete the square and solve the quadratic equation,

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?