Select each graph that shows a function and it’s inverse

Can some one explain this i got sent this. is this a threat i’m scared

Six random samples were taken each year for three years. the table shows the inferred population for each type of fish for each year.

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?