cant tell on some of these if im right or wrong.

13. The expected rate of return from an investment is equal to the expected cash flows divided by the initial investment. T or F 14. The realized rate of return, or holding period return, is equal to the holding period dollar gain divided by the price at the beginning of the period. T or F 15. In general, the required rate of return is a function of (1) the time value of money, (2) the risk of an asset, and (3) the investor's attitude toward risk. T or F 16. Small company stocks have historically had higher average annual returns than large company stocks, and also a higher risk premium. T or F 17. An all-stock portfolio is more risky than a portfolio consisting of all bonds. T or F 18. When you add securities to a portfolio what happens to unsystematic risk? Increase or decrease