Question

Please help i would greatly appreciate it :D

Answer 1

8.
$40+105+x=180\\ x=35$

9.
The sum of two sides must be greater than the third side.
It can't be 5 because $5+5=10\not>12$.
It can't be 7 because $5+7=12\not>12$.
It can't be 17 because $5+12=17\not>17$.
So it's 12.

10.
a. Turk, McAllister
b. Market, Mission, Howard
c. not sure about this one