how should you test a hypothesis?\nby writing a mathematical equation\nby making a single observation\nby…

Brief Explanations:

In the scientific method, a hypothesis is tested through a controlled experiment. This allows for isolating variables to determine the relationship between the independent and dependent variables. Writing a mathematical equation may be part of data - analysis after an experiment, a single observation is not sufficient for testing a hypothesis, and answering a series of questions is more related to surveys or theoretical exploration rather than hypothesis - testing.

Answer:

by performing a controlled experiment