Several students are cleaning cars. they charge $4 for washing and $4 for vacuuming. both forms of cleaning take the same amount of time. they have time to clean 20 cars. they want to raise a total of $80. how many of each types of cleaning should they do? make a system of equations to show the problem. then solve the problem visually or by making a graph.

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

i don't see any

step-by-step explanation: