Easy ! 1.) image produced by a concave lens 2. convex mirror 3. principle use of lenses 4. perpendicular to a surface 5. orientation of all virtual mirror images 6. concave mirror 7. distance from focal point to center of lens 8. normal to center of lens 9. law that produces mirror images diverging converging normal virtual erect focal length axis reflection refraction

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Make a drawing of the electric field lines around a positive charge, then make a second drawing of the electric field lines around a negative charge.

Working alone at its constant rate, pump x pumped out ¼ of the water in a tank in 2 hours. then pumps y and z started working and the three pumps, working simultaneously at their respective constant rates, pumped out the rest of the water in 3 hours. if pump y, working alone at its constant rate, would have taken 18 hours to pump out the rest of the water, how many hours would it have taken pump z, working alone at its constant rate, to pump out all of the water that was pumped out of the tank? a) 6b) 12c) 15d) 18e) 24