What are the three basic steps that scientist use to conduct a scientific investigation

On a distance vs time graph the line of an object at rest is a

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.