How do you do this question

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

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?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex