Answer both questions thanks

See below, please.

Step-by-step explanation:

1. (a) 9/24 = 0.375 = 37.5% (multiply by 100 and put a % sign on the end)

 (b)  60% = 'x' karats

       0.60 = x/24

       x = (0.60)(24) = 14.4 karats

2. (a) 2g 10-karat gold + 2g 14-karat gold

        = (2g * 10/24)  + (2g * 14/24) = (20/24 + 28/24)g = (48/24)g = 2g Gold in a 4-gram alloy, so it is 50% gold

  (b)  6g 24-karat gold + 4g 9-karat gold

        = (6g * 24/24)  + (4g * 9/24) = (144/24 + 36/24)g = (180/24)g = 7.5g Gold in a 10-gram alloy, so it is 75% gold

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