Commutative Property is used here
Complete Question
The complete question is shown on the first uploaded image
Answer:
Step-by-step explanation:
From the question we are told that
The relationship is 
The number of fence post painted by chuck is
The number of fence post painted by Diana is 
can paint 10 fences more than chuck so let say the of fence painted in an hour by chuck is 
Then the number of fence post painted by Diana in one hour is

So



I believe it's c. it's the only reasonable answer.
Hello there!
The question asks us to solve using the substitution method. The equations given are:


We are given a value for y, which is x-8. Substituting
into the first equation of the system of equation gives us:


Use the distributive property to help simplify and solve for x

Combine like terms

Add 24 to both sides


Finally, divide both sides by 5

Now, let's use
in the equation
to find the value of y



Now, we have the values x=5 and y=-3. Putting these values into an ordered pair gives us the answer (5,-3), which is the last answer choice.
Let me know if you need any clarifications, thanks!
~ Padoru
Considering the situation described, the hypothesis tested are given as follows:
- The null hypothesis is

- The alternative hypothesis is

<h3>What are the hypothesis tested?</h3>
At the null hypothesis, it is tested if the standard deviation is not less than $23, that is:

At the alternative hypothesis, it is tested if there is significant evidence t conclude that the standard deviation is less than $23, that is:

More can be learned about an hypothesis test at brainly.com/question/26454209