1. 1 7/8
wait a minute for me to answer number 2
Answer:

Step-by-step explanation:

Here



Answer: -72x+45y+72
Step-by-step explanation:
<h2>
Answer:</h2>
Variance
<h2>
Step-by-step explanation:</h2>
The standard deviation is related to the variance. The standard deviation measures the variation or dispersion of a set of data and is represented by the Greek letter sigma
, while the variance measures how far a set of numbers are spread out from their average value. The variance is obtained by squaring the standard deviation, so the variance can be found as 
Yo bro i got to add words but the answer is 2