Please help fast! I will give brainliest to first correct answer!

Add.
(2x^2+6x=1)+(-7x^2+2x-3)

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?