What is the radius of a circle with circumference 64 ft? Round to the nearest tenth. Use 3.14 for π.
Choose an appropriate formula and solve it for the variable you need to find. Substitute what you know into the rewritten formula. Simplify.
The radius of the circle is about 10.2 ft.
✓ Got it?
Biology The monarch butterfly is the only butterfly that migrates annually north and south. The distance that a particular group of monarch butterflies travels is shown. It takes a typical butterfly about 120 days to travel one way. What is the average rate at which a butterfly travels in miles per day? Round to the nearest mile per day.
How do you know which formula to use?
Read the information given in the problem. This problem gives you a measure of time and a distance. You need to find the rate, so use d = rt.
The butterflies travel at an average rate of about 14 mi per day.
✓ Got it?