Can someone explain what the scientific notation is??

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.

Find the solutions for a triangle with a =16, c =12, and b = 63º

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.