Question

in a scientific inquiry, a variable is a testable explanation for a problem. a factor that does not change. a letter that represents a number. a quantity that can have more than a single value.

Explanation:

In a scientific inquiry, a variable is a quantity that can have more than a single value. It can change during an experiment. A testable explanation for a problem is a hypothesis. A factor that does not change is a constant. A letter that represents a number is an algebraic variable in math, not the definition of a variable in a scientific - inquiry context.

Answer:

D. a quantity that can have more than a single value.