12.325-(2.34x3.9)
12.325-(9.126)
3.199 ~3.2
Answer:
umm i think it is 5 cm but im not sure
Answer:
C. 
Step-by-step explanation:
To find the number of black ribbons one would have subtract the amount of red ribbons from the total number of ribbons. Then one would have to express it as a proportion. Part over whole equals percent over 100. The number of black ribbons over total ribbons equals "b" over 100.