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

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

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5