Which expression is most likely more effective solved using a calculation instead of by hand

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

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?

Aye asap pls ! markin da brainiest too ! btw da step choices are all add, distribute, divide, n subtract