When x increases from a to a + 2, y increases by a difference of 6.

For which functions is this statement true?
A) y = 2(3)x
B) y = 2(9)x
C) y = 3x + 2
D) y = 9x + 2

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation