Multiple. (2x- y) (3x + y)

6x^2-xy-y^2

Step-by-step explanation:

if you want explanation then mark me thanks and follow me

We can use distributive properties 2 times.

First

(2x-y)(3x+y)

=2x(3x+y)-y(3x+y)

Then second time

=6x^2+2xy-3xy-y^2

Now combine like terms

=6x^2-xy-y^2

1. When given a raw score, it must be converted into a z-score (standard score). Raw scores cannot be placed on a normal distribution curve because they do not have the same means and standard deviations, but when it is converted into a z-score, the number of standard deviations above or below the population mean can be measured. The z-scores on the center are average, the scores on the left are lower than average and the scores on the right are higher than average.

2. A z-score is a standard score which can be placed on a normal distribution curve. A z-score indicates the distance of the standard deviations from the mean (center of the curve).