Ben buys packs of golf balls with his new golf club. Write an expression for this situation if the golf club is $45 and the packs of golf balls are $4 per pack.
Remember, we do not know how many packs of golf balls he purchased.
Expression:

4x + 45

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 think it would be 42cm