11: B
12: C
They are both supplementary angles meaning they add to 180 degrees
let's firstly change the 1.2 to a fraction
Prime Factors of 3080 =2, 2, 2, 5, 7, 11
Which is the same as = 23 x 5 x 7 x 11
Prime Factors Tree of 3080
3080
/ \
2 1540
/ \
2 770
/ \
2 385
/ \
5 77
/ \
7 11
/ \
11 1
Answer:
Step-by-step explanation:
answer = 1/2 r + m
m = 7
r = 8
answer = 1/2 * 8 + 7
answer = 4 + 7
answer = 11