Use the following information. The center post on a teeter-totter is 2 feet high. When one end of the teeter totter rests on the ground, that ends is 7 feet from the center point. Write an equation of the line that follows the path of the teeter-totter.

If the value of cos330°is√3/2 then find cos 165°.

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.