They are called the order of operations, or PEMDAS. Hope this helps!
I believe #7 would be 5:13, #8 to be 6:7, #9 to be 13:18, #10 to be 18:5.
I hope this helps.
Answer:

Step-by-step explanation:
From the question we are told that:
Arc
Arc
Given The angle of intersecting chords theorem
Generally the equation for angle BEC is mathematically given by



Answer:
The Circumference of the circle = C = 24π mm
Hence, option C is true.
Step-by-step explanation:
Given
Radius r = 12mm
To Determine
Circumference of circle C = ?
Using the formula to determine the Circumference of the circle
C = 2πr
substituting r = 12mm in the equation
C = 2π(12)
C = 24π mm
Therefore, the Circumference of the circle = C = 24π mm
Hence, option C is true.
Answer:
4f^2 +4
Step-by-step explanation:
4 + 4f^2 + 6f - 6f
Combine like terms
4f^2 +4