Adicion y sustraccion en N: 1. 64356(7) +
45233(7)
54664(7)

2. 342(5) +
213(5)

3. 876542(9) +
356435(9)
743521(9)

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).

One integer is 8 times another. if the product is 72, then find the integers

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]