Easy math question which of the following sets is closed under multiplication? a) {0, 1, 2, 4} b) {0, 1} c) {1, 2} d) none of the sets are closed under multiplication.

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?