Answer:
Draw a Venn diagram with the left circle labeled brother, and the right labeled sister. Label the middle both and fhe outisde neither. Put 5 in brother, 3 in sister, 6 in both and 6 in neithrr.
Step-by-step explanation:
11+9 = 20
20-6 = 14
20-14=6
There are 6 that have both
It’s B because it’s smaller than -3 but slightly greater than -4
(x1, y1) = (3,8)
(x2, y2) = (1,0)
I don't know for a fact but I think k=1.125