Problem 2 and then A and B

What is the difference between regular convex and concave polygons

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)