Can someone please help me? Which of the following statements demonstrates the associative property of multiplication?
A. 4 · (3 · 6) = (4 · 3) · 6
B. 6 · 4 = 4 · 6
C. -3 · 1 = -3
D. 2(24) = 2(20 + 4)

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?