Answer:
Third option.
Step-by-step explanation:
You need to remember that the formula used to calculate the arc lenght is:

Where "r" is the radius and "C" is the central angle in radians.
You need to solve for "C":
You know the radius and the arc lenght, therefore, you can substitute values to calculate the central angle in radians. Therefore, this is:

Answer:what are the choiese
Step-by-step explanation:
3a plus 7. you group the whole numbers together and than the a's. so 3+4 is 7. 2a + a is 3a.
Domain: All real numbers (-infinity, infinity)
Range: [9, -infinity)
Equivalent ratio means equal in value
18:4 = 9:2 = 36:8