B) The radius of curvature of a convex mirror is 60cm If the image formed by the mirror is a quarter of size of the object, what is the distance of the object from the mirror?

Answer8.0m;

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

The answer is a hat a nice day sir or ma'am