Please and thank you

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

Displacement is the slope of a velocity vs. time graph a. true b. false

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.