The kingdom of Ghana traded what products and ideas across the Sahara desert?

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?

Which ofbthe following is a characteristic shared by both brazil and mexico

How does central place theory explain patterns in the size and distribution of cities?