Can someone help me with this please I’m stuck on this

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

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form