Scientists use the system of to write very large or very small numbers.
A. scientific notation
B. numbers
C. metrics
D. standards

scientific notation is the system to write very large or very small number.

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).

y=sec x is the correct answer

~batmans wife dun dun