Terrance and jesse are training for a long distance race. terrance trains at a rate of 6 miles every half hour, and jesse trains at a rate of 2 miles every 15 minutes. what is the unit rate in miles per hour for each runnner?

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.