The map of a biking trail is drawn on a coordinate grid.

the trail starts at p(−2, 1) and goes to q(6, 1).
it goes from q to r(6, −3) and then to s(9, −3).

what is the total length (in units) of the biking trail?

a. 11
b. 15
c. 18
d. 19

The distance from (-2,1) to (6,1) is 8 units

The distance from (6,1) to (6,-3) is 4 units

The distance from (6,-3) to (9,-3) is 3 units

Now add 'em up: 8 + 4 + 3 = 15

The length of the biking trail is 15 units long!

Hope that helps!

B. L=15 units

Step-by-step explanation:

We have four points:

P(-2,1)

Q(6,1)

R(6,-3)

S(9,-3)

If you have two points the distance between those points is  the length of the segment that separates them. And the formula of that distance is:

Then we have to calculate:

1. The distance between P and Q:

2. The distance between Q and R:

3. The distance between R and S:

Then the total length of the biking trail is:

The answer is:

B. L=15 units