Apack of gum costs 50 cents. that is 4 cents less than four times what the pack cost 15 years ago. write an equation that could be used to find the cost of the gum 15 years ago. then solve and find the price of gum 15 years ago

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