Help me en write a letter to my teacher

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?

What percentage of the earth's water is available for use by living things?

If you perfer to learn by reading to yourself instead of participating in a group discussing, you are most likely an