Seven yachts enter a race. First, second and third places will be given to the three fastest yachts. How
many arrangements of first, second, and third places are possible with seven yachts?

Abari owns 100 shares of stock a and 45 shares of stock b. for the past month, his stocks have been fluctuating inversely. stock a decreased by m cents per share and stock b increased by n cents per share. which equation can be used to find the total change in value of jabari's shares per month?