What is the frist thing you should do when making an individual decision

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight