1. Suppose that after buying a new car you decide to sell your old car to a friend. You accept a 360-day note for $35,500 at 20% simple interest as payment. (Both principal and interest are paid at the end of 360 days.) Sixty days later you find that you need the money and sell the note to a third party for $15,000. What annual interest rate will the third party receive for the investment? Express the answer as a percentage, correct to three decimal places.

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

What is the slope of the line passing through the points (-5, 7) and (-3,5)?