Answer:
Hence the critical value for the right-tailed test is . Since the test value is greater than the critical value so we reject the null hypothesis.
Step-by-step explanation:
Hypotheses are:
Here we have s_{1}=6800 and s_{2}=3900. Here we will use F -test. The Value of test statistics is
Here the degree of freedom of the numerator is and The degree of the denominator is
The critical value for the right-tailed test is . Since the test value is greater than the critical value so we reject the null hypothesis.
C is the area that is shaded region
Through the distributive property, we know to multiply both numbers in the parentheses by 7. This gives us 7(40) + 7(2). Next, we have to simplify by multiplying the terms out. This gives us 280 + 14. Finally, we add and get a sum of 294. However, the question only asks for the distribute step. Therefore, your answer is B. 7 x 40 + 7 x 2.
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To cross out a variable (in this case, x) we can add both equations together to get -5y=10. Dividing both sides by -5, we get y=-2. Next, plugging it into -3y+5x=26, we get 6+5x=26. Subtracting 6 from both sides, we get 5x=20. Next, we can divide both sides by 5 to get x=4