Please answer 1-7 thank you so much btw

Answer/Step-by-step explanation:

Formula for the circumference of a circle is:

C = πd,

Where d = diameter

Or

C = 2πr, when r = radius

1. r = 4.5 mm

C = 2*π*4.5

C = 28.3 mm

2. r = 8 in.

C = 2*π*8

C = 50.3 in.

3. d = 21 ft

C = π*21

C = 66.0 ft

5. d = 42 m

C = π*42

C = 131.9 m

6. d = 11 in.

C = π*11

C = 34.6 in.

7. r = 31.5 cm

C = 2*π*31.5

C = 197.9 cm

go on the tube you might find some information there

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour