Radius = 13 inches
Circumference of wheel = 1 revolution
2πr = 2 x 3.14 x 13 = 81.64 inches
1 revolution = 81.64 inches
30 revolutions = 2449.2inches
No it definitely doesn't. it changes.

Method 1.
Use 

Method 2.

The solution to this equation is the number 8
Answer:
i think it's rate of <em>1% </em>for the first one and id.k what the other one is, srry.
Step-by-step explanation:
Volume of prism = 5 x 5 x 12 = 300 cubic centimeters
Volume of pyramid = 5 x 5 x 6 = 150 cubic centimeters
Volume of space = 300 - 150 = 150 cubic cm