Answer:
-7b+3
Step-by-step explanation:
first step you will find numbers if you take -2.2 to get those numbers
Considering the situation described, the scientist's null and alternative hypothesis are described by:
Null hypothesis
; Alternative hypothesis
.
<h3>What are the hypothesis tested?</h3>
At the null hypothesis, it is tested if there is no difference, that is, the difference of the means represented by
is of 0, hence:

At the alternative hypothesis, it is tested if there is a difference, hence:

More can be learned about an hypothesis test at brainly.com/question/26454209
Find a common denominator in the two fractions before you can do anything
\left(\mathrm{Decimal:\quad }x=-0.75\right)
hope it helps :P