A circle has its centre at the origin and has the equation - x squared+y squared=81 what is the radius

What is the measure of ac? 5 units 13 units 26 units 39 units

What are “like terms”? why can we only add like terms?

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?