How many significant figures are in 31400

If two objects at different te, peraure are in contact with each other what happens to their temperature

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

Iam hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?