Answer:
13
Explanation:
13.0120481928 it is the distance
The diameter of the reflecting surface of spherical mirror is called its aperture. Mirrors whose aperture is much smaller than its radius of curvature, we use R=2f.
Answer:
C
Explanation:
because it not running will set it off course but running all the time it will run. out of fuel
Less than. A machine should have equal or more output than input to have a high efficiency. :)