An online subscription service has calculated the ratio of active subscriptions to expired subscriptions and found that the ratio is 0.4 to 1. What does this ratio mean?

Find the mean hourly cost when the cell phone described above is used for 240 minutes.

Analyze each of the following problems to determine whether the problem is a direct or inverse proportion and solve. Round the answers to 3 decimal places where necessary. a. A reamer tapers 0.0975 inch along a 3.2625-inch length. What is the amount of taper along a 2.1250-inch length? b. A machine produces 2550 parts in 8.5 hours. How many parts are produced by the machine in 10 hours? c. Of two gears that mesh, one gear with 12 teeth revolves at 420 rpm. What is the revolutions per minute of the other gear, which has 16 teeth?