You have the following rates of return for a risky portfolio for several recent years: 2011 35.23% 2012 18.67% 2013 −9.87% 2014 23.45% if you invested $1,000 at the beginning of 2011, your investment at the end of 2014 would be worth a. $2,176.60 b. $1,785.56 c. $1,247.87 d. $1,645.53

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?