Which explicit function defines this geometric sequence? 3, 1, 1/3, 1/9, ...

A. f(n) = 1/3 x 2^(n-1)
B. f(n) = 3 x (1/3)^(n-1)
C. f(n) = 1/3 x 3^(n-1)
D. f(n) = 2 x (1/3)^(n-1)

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.

If u good at math hit me up on insta or sum @basic_jaiden or @ and

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms