Hey, can anyone here tell me how to identify different forms of linear equations, and what those forms are?

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%