The explanation for this is one of my favorite pieces of mathematical reasoning. First, let's thing about distance; what's the shortest distance between two points? <em>A straight line</em>. If we just drew a straight line between A and B, though, we'd be missing a crucial element of the original problem: we also need to pass through a point on the line (the "river"). Here's where the mathemagic comes in.
If we take the point B and <em>reflect it over the line</em>, creating the point B' (see picture 1), we can draw a line straight from A to B' that passes through a point on the line. Notice the symmetry here; the distance from the intersection point to B' is<em> the same as its distance to B</em>. So, if we reflect that segment back up, we'll have a path to B, and because it came from of the line segment AB', we know that it's <em>the shortest possible distance that includes a point on the line</em>.
If we apply this same process to our picture, we see that the line segment AB' crosses the line
at the point (1, 1)
That is not a regular graph
We know that perimeter is the sum of all the sides.
We know the one side is 15 ft.
The other two are both equal to x, so the sides are the same length.
35-15= 20
Both of the sides together equal 20. Divide this in half to find the length of each individual side.
20/2= 10
x= 10
I hope this helps!
~kaikers
Answer:
C. (-7,-2)
Step-by-step explanation:
hope this helps
5 x 3 = 15
30 x 3 = 90
15+90=105
so that person paid $105 for that day