Answer:
18.5 cm
Explanation:
From;
1/u + 1/v = 1/f
Where;
u= object distance = 86cm
image height = 23 cm
Radius of curvature = 37 cm
The radius of curvature (r) is the radius of the sphere of which the mirror forms a part.
Focal length (f) = radius of curvature (r)/2 = 37cm/2 = 18.5 cm
Therefore, the focal length of the mirror is 18.5 cm
I’d say 4 because running a mile in 6 minutes is better than what most people can do and that will really make your heart rate go up
B) lever and pulley is the answer
<span>It's either the inguinal or the groin </span>