Atriangle has sides measuring 8 inches and 12 inches. if x represent the length in inches of the third side, which inequality gives the range of possible values for x

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?