Testable hypotheses that lead to experiments usually describe a relationship between two measurable variables. a measurable variable and a subjective opinion. more than two subjective opinions. more than two measurable variables.

I believe the correct answer from the choices listed above is the first option. Testable hypotheses that lead to experiments usually describe a relationship between two measurable variables. A testable hypothesis is a form of hypothesis that can either be supported or else falsified from data or experience. 

Alinear relationship would look like a straight line on the graph. it could have a positive negative or 0 slope. so it could be a line potentially going in any direction but it must be perfectly straight.

Your answer is 32 hope i