Answer:
D. pi
Step-by-step explanation:
Circumference of a circle = 
Diameter = d
Therefore, ratio of circumference of a circle to its diameter would be:

=> (d cancels d)
Therefore, the ratio of the circumference of a circle to its diameter is 
Answer:

Step-by-step explanation:
Since you are doing
squared, you have to multiply the exponents.
4 * 2 = 8

Answer:
9 miles
Step-by-step explanation:
15/5=3
so 3x3= 9 miles
Hope the picture will help you...
Answer:
-X – 10=-1(x+10) is your answer