you're shopping for a rack switch, what component on the switch tells you it can be mounted to a rack?

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Is the time in tennessee the same as florida

If a star is moving toward earth, it is