The weight of 10,000 identical samples is 100 pounds. what is the weight of 10 samples

We can write a proportion

10,000 identical samples is 100 pounds

10 identical samples is x pounds

10000/10 = 100/x

10000x=10*100

x=1000/10000=1/10=0.1

x=0.1 pound

10 samples have the weight 0.1 pound.

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