The pear company sells pPhones. The cost to manufacture x pPhones is C(x)=-23x^2+50000x+20461 dollars (this includes overhead costs and production costs for each pPhone). If the company sells x pPhones for the maximum price they can fetch, the revenue function will be R(x)=-26x^2+128000x dollars. How many pPhones should the pear company produce and sell to maximize profit? (remember that profit = revenue - cost)

Your subscription to investing wisely weekly is about to expire. you plan to subscribe to the magazine for the rest of your life, and you can renew it by paying $85 annually, beginning immediately, or you can get a lifetime subscription for $620, also payable immediately. assuming that you can earn 6.0% on your funds and that the annual renewal rate will remain constant, how many years must you live to make the lifetime subscription the better buy?