Answer:
9) 28
10) 22
Step-by-step explanation:
collinear means on the same line
9 ) AB+BC=AC
16+12=28
10) 13+9=22
m + m = 36
18 + 18 = 36
7
(-1^2)x 3 = 3
-1 x 4 = -4
3--4 = 7
B
let the angles be 3k,10k,2k
then 3k+10k+2k=180
15k=180
k=180/15=12
x=10k=10×12=120°