Step-by-step explanation:

Answer:
The area of the triangle is
.
Step-by-step explanation:
The area <em>A</em> of a triangle is given by the formula
where <em>b</em> is the base and <em>h</em> is the height of the triangle.
From the graph, we can see that the base is 3 units and the height is 4 units. Therefore, the area of the triangle is

I’m not sure if the 15 is the question number but if it is the answer is 32. use PEMDAS
All possibilities = 9!
possibilities that harry sits at an end = 8! + 8!
possibilities that harry doesn't sit at an end = 9! - 8! -8!
As AB and ED are parallel, they have the same slope. This means that since lines that are colllinear with parallel segments are parallel, lines l and m are parallel.