Your classmate is starting a new fitness program. he is planning to ride his bicycle 60 minutes every day. he
burns 7 calories per minute bicycling at 11 mph and 11.75 calories per minute bicycling at 15 mph. how long
should he bicycle at each speed to burn 600 calories per hour?

f-1(x)= cube root of 19x squared/x

step-by-step explanation:

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet