What is the next 3 term sequence for 1,3,7,13,21 how do you solve it

Let event a = you roll an even number on the first cube.let event b = you roll a 6 on the second cube.are the events independent or dependent? why?

Find the area of the region between a regular hexagon with sides of 6" and its inscribed circle.

Plz asap what is the range of the cluster in the scatter plot a. between 4 and 8 years of experience b. between $40,000 and $60,000 c. between 6 and 12 years of experience d. between $10,000 and $60,000