ANSWER THIS CORRECTLY I NEED THE ANSWERS FOR THE EMPTY BOXES I WILL MARK BRAINLIEST (look at the picture i inserted)

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Interest begins accruing the date of the transaction except for auto loans mortgages credit card cash advances credit card purchases

Fill in the missing exponents in each box and show how you found the answer. (4 points: 2 points for each correct answer with work shown) c. (9^4)^? =9^1 d.(5^? )^3=5^1 *question marks represent the boxes