The points L, M, N and O all lie on the same line segment, in that order, such that the ratio of LM: MN:NO is equal
to 2 : 2:1. If LO 30, find MN.

Is a positive integer raised to a negative power always positive

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample