Factor completely x8 − 625.

(x4 − 25)(x4 + 25)
(x2 − 5)(x2 + 5)(x4 − 25)
(x2 − 5)(x2 − 5)(x4 − 25)
(x2 − 5)(x2 + 5)(x4 + 25)

The answer is D) (x2 − 5)(x2 + 5)(x4 + 25)

The answer is D) (x2 − 5)(x2 + 5)(x4 + 25)

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