Ihate this because i can't figure out which ones parallel and which ones you add up. triangle part has me confused.

Is the alien theory a scientific claim? why or why not? just took the test it was , : " the alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source."

An object is located 30.0 cm from a concave mirror. the focal length is 15.0 c,. what is the image distance? a. 30.0 cm b. -10 cm c. 10.0 cm d. -30.0 cm

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more