What is the coefficient in the expression 5v2+3 ?k

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction