Please help me with math problems!
20 points for all questions plz

Step-by-step explanation:

1) r = 11 feet

 Circumference = 69.1 ft

2) r = 7yd

  Circumference = 43.98 = 44 yd

3) r = 6.3 m

   Circumference = 39.6

4) r = 11.8 ft

    Circumference = 74. 1 ft

5) r = 2 km

  Circumference = 12.6 km

6) r = 9 mi

 Circumference = 56.6 mi

7) r = 6 ft

 Circumference = 37. 7ft

8) r = 8. 4 ft

   Circumference = 52.8 ft

11) d = 4m

  Circumference = 12.6 m

12) d = 22 mi

    Circumference = 69.1 mi

13) d = 5m

    Circumference = 15.7 m

14) d = 8yd

   Circumference = 25.1 yd

15) d = 16.8 m

  Circumference = 52.8 m

16) d = 6cm

  Circumference = 18.9 cm

17) d = 14 in

   Circumference = 43.98 = 44 in

18) d = 16km

 Circumference = 50. 3 km

-18.27 per year

Step-by-step explanation:

The difference in years:

= 2015 - 2004

= 11 years

Total Decrease:

= 949 - 748

= 201 runs

Rate of Change:

= 201/11

= 18.27

Because it is reducing, the rate is:

= -18.27 per year

(other person deserves brainliest cause they answered first)