Solve the system of equations. X + y = -4 and y= -x + 5
1 answer:
Answer:
NO SOLUTIONS!!
Step-by-step explanation:
We are given the equations of two lines:
and
.
Here, we are to find two ral numbers, such that
and
at the same time. This is clearly not possible.
So we say this system of equations is inconsistent and have no solutions.
This means that when we graph them these two lines will never intersect and in fact they are a pair of parallel lines.
So, the system does not have a solution.
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Answer:
B) At alpha = 0.01, there is insufficient evidence to conclude the true mean wind speed at the site exceeds 25 mph.
Step-by-step explanation:
P-value of the test:
The p-value of the test is the probability of finding a sample mean above 25.
We are using the t-distribution, with test statistic t = 1.25 and 43 - 1 = 42 degrees of freedom. This probability is a right-tailed test.
With the help of a calculator, this p-value is of 0.1091.
Since the p-value of the test is 0.1091 > 0.01, at there is insufficient evidence to conclude the true mean wind speed at the site exceeds 25 mph, and the correct answer is given by option B.