Subtracting<span> a </span>negative<span> number from a </span>negative<span> number—when you see the subtraction (</span>minus<span>) sign followed by a </span>negative<span> sign, turn the </span>two<span> signs into a plus sign. Thus, instead of </span>subtracting<span> a </span>negative, you are adding a positive.
Answer:
D
Step-by-step explanation: it the line is going done the linear function is decreasing causing both negative infinity and infinity to decrease
Answer:
Step-by-step explanation:
C
To hard sorry try Socratic it’s a app that helps with math problems
Answer:

And for this case we want to test the following hypothesis:
Null hypothesis: 
Alternative hypothesis: 
For this case since the lower value of the confidence interval is higher than 42000 we have enough evidence to reject the null hypothesis at the 55 of significance and we can conclude that the true mean is significantly different from 42000
Step-by-step explanation:
The confidence interval for the mean is given by the following formula:
(1)
And for this case the 95% confidence interval is already calculated as:

And for this case we want to test the following hypothesis:
Null hypothesis: 
Alternative hypothesis: 
For this case since the lower value of the confidence interval is higher than 42000 we have enough evidence to reject the null hypothesis at the 55 of significance and we can conclude that the true mean is significantly different from 42000