Question content area top Part 1 Students stuff envelopes for extra money. Their initial cost to obtain the information for the job was ​$180. Each envelope costs ​$0.03 and they get paid ​$0.05 per envelope stuffed. Let x represent the number of envelopes stuffed. ​(a) Express the cost C as a function of x. ​(b) Express the revenue R as a function of x. ​(c) Determine analytically the value of x for which revenue equals cost.