Answer:
The test statistic (z-score) of this one-mean hypothesis test is z=1.823.
Step-by-step explanation:
The null and alternative hypothesis are:

The significance level is 0.05.
The sample size is n=22.
The sample mean is M=157.
The standard deviation is 18.
The z-score can be calculated as:

The test statistic (z-score) of this one-mean hypothesis test is z=1.823.
Answer:
a = 180 - b - c
Step-by-step explanation:
To solve for a variable, move all the terms to the other side except a. You move terms across an equal sign using inverses.
So subtract b and c to the other side.
True-... i think because like i am not sure-
Answer:
24
Step-by-step explanation:
You can use the Pythagorean Theorem to solve this:

The legs of the triangle are put into either a or b and the hypotenuse is put into c. In this case, they've already given you the hypotenuse, but now you need to find the leg:

2025 +
= 2601
<em><u>Subtract 2025 from both sides:</u></em>
2025 +
= 2601
-2025 -2025
_____________
= 576
<em><u>Square root:</u></em>

b = 24