Which of the following represents a function?

Option D

Step-by-step explanation:

A relationship is a function if and only if for each input value x (domain) only one output value y is assigned (Range)

Option A.

Note that x represents the input values and y represents the output values.

When then and .

The input value has two output values  y assigned.

So the relationship is not a function

Option B.

Note that x represents the input values and y represents the output values.

When then and .

The input value has two output values y assigned.

So the relationship is not a function

Option C

Note that x represents the input values and y represents the output values.

When then and .

,

The input value has two output values y assigned.

So the relationship is not a function

Option D

Note that x represents the input values and y represents the output values  and for each input value x (domain) only one output value y is assigned (Range)

So the relationship is a function

answer: .75 km

step-by-step explanation: