Resolver las siguentes ecuaciones: 1. 4/3x-2/5=7/5x-1/10

2. 5x/6-7/4+2x/3=2x-5/12+x/3

3. 5/3x-1/6=x+1/4

4. 5x-9/3+x/2=10

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).

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.