Which describes the steps that can be used to solve this problem?

flora bought 6 paperback books at the book sale. each book cost $4. she gave the cashier $30. how much change would flora get?

a. calculate the amount of money that 6 books cost. divide that number by the amount of money flora gave the cashier.

b. calculate the amount of money that 6 books cost. subtract that amount from the amount of money flora gave the cashier.

c. calculate how much one book costs. multiply that number by the amount of money flora gave the cashier.

d. calculate the amount of money that 6 books cost. add that number to the amount of money flora gave the cashier.

i will mark as brainliest.

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution