<span>90396
All you have to do is multiply those numbers:) </span>
Answer:
7x-6
Step-by-step explanation:
x+3+3x-18+3x+9 (Add like terms)
(x+3x+3x) (3-18+9) (solve) ( x is the same as 1x)
(7x) (-6)
7x-6
I would go about solving this by elimination because the x variables are already the same so all you would have to do is change one equation to the opposite signs and add them, so it would look like:
7y + 5x = 19
+ -3y - 5x = -7
-------------------
4y=12
y=3
The test statistics is used to determine if the anxiety medication can happen under a null hypothesis
The test statistics that is an appropriate hypothesis test is 
<h3>How to determine the test statistic</h3>
<u>40 milligrams of medication</u>
Patients = 60
Lower stress level patients = 21
The mean of this medication is:

So, we have:


<u>75 milligrams of medication</u>
Patients = 85
Lower stress level patients = 34
The mean of this medication is:

So, we have:


The test statistic is then calculated as:

The equation becomes

Hence, the test statistics that is an appropriate hypothesis test is 
Read more about test statistic at:
brainly.com/question/15980493
A because two negatives make a positive