I need this pls I’m in a test no cap

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship

What’s the answer? and how do i solve it ?

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