1/f = 1/15 + 1/30, what is f?
physics in terms of lenses please help.

How many meters will a car travel if its speed is 45 m/s in an interval of 11 seconds? question 2 options: a) 450 meters b) 495 meters c) 4.09 meters d) 498 meters

Elements that have one valence electron and are very reactive are called

Look at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way