Last night, Adaline slept for 10 hours. APPROXIMATELY what percentage of a full day did she sleep?

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).