HELP NEEDED PLEASE god i hate math

What is the slope of the line that passes through the points listed in the table?

x | y
3 | 11
6 | 17

A. 2
B. 3
C. 6
D. 9

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected