Help please Simplify (4^1/5)^5

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?

Solve this problem! extra ! 3025/5.5 = a/90.75

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?