Tony misplaced 7 stamps from his collection. he knows that each stamp of his worth $0.15 and that the total value of them is now only $5.55. write an equation to determine the number of stamps (s) that tony originally had.

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?