Can someone help me ASAP PLS !

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

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Which equation represents the model shown? a)1/3 divide 1/6 = 2 b)2/3 divide 1/6 = 2/18 c)1/3 divide 1/6 = 1/18 d)2/3 divide 1/6 =4