Who wants to talk and hang out on here? I'm a virtual student and me and my bsf were talking but then she went to lunchhh so I'm bored now:(

In the diagram below dab and dac are adjacent angles

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.