{(-7, 200). (3.5). (0.5). (-2.0). (6.4), (-6. -9), (4,4}
Is this function or not function

Not function

Step-by-step explanation:

I think this is not function because if the x value has same numbers then its not a function. :)

except a rational number. : )

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