A circle with circumference, 20 has an arc with a 72∘ central angle. What is the length of the arc?

1.27

Step-by-step explanation:

The arc length formula is s = rФ, where Ф is the central angle in radians.  

Here, r = C / (2π), or  r  =20 / (6.28).

Then the arc length is s = rФ = (20/6.28)(72π/180) = 1.27

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!