What is the central angle used to find the area in a circle?

In the 30-60-90 triangle below side s has a length of and side r has a length

Which of the following points is collinear with (-2,1) and (0,3)

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?