Answer:
-8xy+2xy=-6xy
C
Step-by-step explanation:
the cosine of an angle = , hence
cos 30° = → C
7%*12=6%(12+x)
.84=.72+.06x
.06x=.12
x=2
how much water should be added to 12 mL of 7% alcohol to reduce concentration to 6%? 2 ML
