Three siblings are participating in a family-friendly running event. - The oldest sibling begins at the start line of the race and runs 7 miles per hour the entire time. - The middle sibling begins at the start line and walks at 3.5 miles per hour throughout the race. - The youngest sibling joins the race 4 miles from the start line and runs 5 miles per hour the rest of the way.

The siblings walking or running at a constant rate, illustrates a linear function.

The complete question requires that, we match each graph to the sibling (see attachment)

Oldest sibling

--- start line

So, the equation is:

When

This means that;

The graph of the oldest sibling passes through

The graph of the oldest sibling is Graph B

Middle sibling

--- start line

So, the equation is:

When

This means that;

The graph of the middle sibling passes through

The graph of the middle sibling is Graph C

So, we can conclude that:

The graph of the youngest sibling is Graph A

Read more about graphs at:

link

7.3

step-by-step explanation: