How do weathering and erosion play a part in rock formations

Witch one is it soo it the the question b.a,b,c,d

:calculate the sum of the interior angles of a 13-sided polygon.

Alaina wants to decide whether her current cell phone plan is better than a package that another company offers. to compare the two plans, she plotted two lines on a graph, where y represented the total cost of one month’s service and x represented the megabytes of data that she used in a month. which part of the graph will represent the cost per megabyte of data used in each plan?