Roger bought 800 shares of a company's stock for $15.34/share. He pays a broker a commission of $20 to buy or sell stock. After one year, Roger sold all his shares, when they were worth $18.77/share. How much did it cost to buy the stock? What is the net gain or loss? What was the rate of return?

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?

How are algebraic expressions evaluated using substitution?