Question

1. two quantities are proportional if the ratio between the quantities is ________.

constant
proportional
unit rate
unequal

Explanation:

Proportional quantities are defined such that their ratio remains unchanged (fixed) across all values of the quantities. The other options do not fit this core definition: "proportional" is redundant, "unit rate" is a specific type of ratio, and "unequal" contradicts the proportional relationship.

Answer:

A. constant