What are the core capabilities of amazon google and wal-mart

Which of the following statements accurately describes how costs and benefits are calculated?

Classifying inflows and outflows of cash classify each of the following items as an inflow (i) or an outflow (o) of cash, or as neither (n). lg 2 lg 2 item change ($) item change ($) cash +100 accounts receivable −700 accounts payable −1,000 net profits +600 notes payable +500 depreciation +100 long-term debt −2,000 repurchase of stock +600 inventory +200 cash dividends +800 fixed assets +400 sale of stock +1,000

Stocks a, b, and c are similar in some respects: each has an expected return of 10% and a standard deviation of 25%. stocks a and b have returns that are independent of one another; i.e., their correlation coefficient, r, equals zero. stocks a and c have returns that are negatively correlated with one another; i.e., r is less than 0. portfolio ab is a portfolio with half of its money invested in stock a and half in stock b. portfolio ac is a portfolio with half of its money invested in stock a and half invested in stock c. which of the following statements is correct? a. portfolio ab has a standard deviation that is greater than 25%.b. portfolio ac has an expected return that is less than 10%.c. portfolio ac has a standard deviation that is less than 25%.d. portfolio ab has a standard deviation that is equal to 25%.e. portfolio ac has an expected return that is greater than 25%.