How do you solve this please help

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

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Rectangle pqrs has length a and width 4b. the x-axis bisects ps and qr what are the coordinates of the vertices