LagTho

The answer is C. It's obviously a reflection across the x axis, and then just use similar triangles, and see which points are the same. 

Hope this helps!

Not exactly sure what the question is here. The one comes up twice because numbers go 9 then 10.

That's fine. Sorry I couldn't be any help!

So we have 2x - y = 9 and 3y + x = 1. Take the first one, and solving for y gets us y = 2x - 9. Substitute this into the second equation, and you have 3(2x - 9) + x = 1. Simplifying the left hand side gets us 6x - 27 + x = 1. 7x = 28. x = 4. Put this into either one, (I'm going to use the first) and you get 2(4) - y = 9,

8 - y = 9, -y = 1, so y = -1 and you can check this by putting both values of x and y into either equation. 

x = 4

y = -1

Hope this helps!

1. There's definitely a formula for this, but I don't know it. So I just did 1000 * 1.05, and then timesed that by 1.05, and I just did that 6 times and I got 1340.09564063.

2. \(\frac {-5}{1176}\) I think

Seeing how we have low numbers, it's just trial and error. RRRRD, RRRDD, RRDDD, RDDDD, where R is Republicans and D is Democrats. It doesn't matter whether you do RRDRR or RRRRD, they are the same thing. So counting them, we have 4 possible scenarios. 

Hope this helps!

Oops. Apparently I had no idea what I was talking about.

If I'm reading this right, you just need to put t as 0 and 8.

Wow rude. Glad I could help tho

If I'm reading this correct, that last bit of information about E is unneccesary. The area of a trapezoid is the average of the bases times the height. Since BC is perpendicular to the bases, (AB and DC) it is the height. To find the average of the bases, add them together and divide them by how many factors there are. So \(A = \frac {14 + 18}{2} \cdot 7 = 16 \cdot 7 = 112\).

Hope this helps!

Explains why CPhills is so high...

I was gonna say Oscillation, but that works too. Good job!

If you have basic problems like this, then you might find a calculator more useful than a forum. However, the answer is 73456512. Just plug it into a calculator, and there you have it.

Hope this helps!

It doesn't specify what type of quadrilateral, so you can use any kind, and I would think a square would be the easiest to prove. Draw the diagram, label the points, and see if you can prove it from there. 

Hope this helps!

Let all possible slopes be S. S is anything bigger than or equal to 1, and anything smaller than or equal to -1.

If you draw the diagram, you can see that the pentagon is made up of the three triangles that we got the area of. So \(A=10.2+11.5+16.3=38\).

Hope this helps!