Can y’all please help me on the geometry problems i posted it would mean a lot

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

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

5(-9w) put expression in distributive property