If there is a 7 1/2 foot long couch and i want to scale it down with 1 inch : 2 feet what would the length be

Step-by-step explanation:

1 inch = 2 ft

7 1/2 ft is the same as 7.5 ft

make a proportion

1 inch to 2 ft = x inches to 7.5 ft

make a proportion...

1 / 2 = x / 7.5

cross multiply

(2)(x) = (1)(7.5)

2x = 7.5

x = 7.5 / 2

x = 3.75 inches or 3 3/4 ft <===

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

not sure but it may be b, as i said i'm not sure.