I don’t think you wrote it correct but anyway I think the answer to your question is statement number 1
Answer:
The test statistic value is 15.3.
Step-by-step explanation:
The hypothesis for this test is:
<em>H</em>₀: The average number of homeless people is not increasing, i.e. <em>μ</em> = 42.3.
<em>H</em>ₐ: The average number of homeless people is increasing, i.e. <em>μ</em> > 42.3.
Given:

As the population standard deviation is provided use a single mean <em>z</em>-test for the hypothesis testing.
The test statistic is:

Thus, the test statistic value is 15.3.
Ok so area is length times width. A square has the same sides all around, which is called a quadrilateral. So you would plug in 40 for length and width. 40x40= 1,600 cm^2 <———— is your answer.
Hope this helped :)