You want to start a lawn and land-scaping business. your initial investment, including mowers, rakes, and other supplies, will cost $9500. for each lawn you mow, you project that you will spend $5.50 on gas as well as $7.50 in labor costs. you can charge $55 for each lawn. let x be the number of lawns you mow. for this business venture: a. write the cost function, c(x). b. write the revenue function, r(x). c. determine the break-even point. describe what this means.