8.
![40+105+x=180\\ x=35](https://tex.z-dn.net/?f=40%2B105%2Bx%3D180%5C%5C%0Ax%3D35)
9.
The sum of two sides must be greater than the third side.
It can't be 5 because
![5+5=10\not>12](https://tex.z-dn.net/?f=5%2B5%3D10%5Cnot%3E12)
.
It can't be 7 because
![5+7=12\not>12](https://tex.z-dn.net/?f=5%2B7%3D12%5Cnot%3E12)
.
It can't be 17 because
![5+12=17\not>17](https://tex.z-dn.net/?f=5%2B12%3D17%5Cnot%3E17)
.
So it's 12.
10.
a. Turk, McAllister
b. Market, Mission, Howard
c. not sure about this one
there is not such thing as an I axis, but I will show you what happens for both x and y axis so you can fill out the assignment with the correct information.
IF you meant flipping over the x axis, then the dot will go from top to bottom, bottom to up, the x position won't change only its height(y position)
This meant that for reflecting across the x axis, (x,y)->(x,-y)
For y axis its the opposite, just flipping to the side.
This meant that for reflecting across the y axis, (x,y)->(-x,y)
The ratio is common, so you could write:
a1 * r^4 = a^5 (you do r^4 because there are 4 times you need to multiply by the ratio to get from a1 to a5)
Plug in the values:
3 * r^4 = 48
Divide by 3:
r^4 = 16
Take the fourth root of both sides:
r = 2
The common ratio is 2.