Coffee is a mixture of water, caffeine and a
number of plant chemicals. Different cups of
coffee may have different amounts of these
chemicals, but the ratio of the chemicals is the
same throughout any given cup of coffee
Coffee is
homogeneous.
heterogeneous
DONE

The answer to your question is Homogeneous mixture

Step-by-step explanation:

There are two kinds of mixtures

Homogeneous is the mixture in which all in parts are the same, we can not distinguish its components. Ex Mayonnaise

Heterogeneous is the mixture in which we can distinguish some or all of its components. Ex. Pizza

In this example, we can not distinguish the different components of coffee so it is a homogeneous mixture.

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.