Jonah participated in a 6 mile marathon benefiting a local charity. If he completed the marathon in 90 minutes, calculate his speed.

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

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.

Ray 2 should cross through the focal point on the right side of the lens

Phagocytes contain digestive enzymes to facilitate the process of phagocytosis