I'm stuck on number 2.

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price