Laura wants to develop a model that shows how natural processes can suddenly change the earths surface. which of the following could she show in the model?

a. erosion of a sandy beach by storms

b. formation of a canyon by a river

c. craving of a valley by a glacier

d. weathering of rocks by wind

plz!

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

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

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.