Two radar stations located 20 miles apart both detect a UFO between them. The angle of elevation measured by the first station is 35 degrees. The angle of elevation measured by the second station is 15 degrees. What is the altitude of the UFO?

Which describes an image that can be produced by a concave lens? the image is real and smaller than the object. the image is virtual and larger than the object. the image is virtual and smaller than the object. the image is real and larger than the object.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Ais not a compound machine. a. bolt b. shovel c. handcart (dolly) d. see-saw (teeter totter)