Answer:
AC = 12 cm
Step-by-step explanation:
AB=9 centimeters, you figure out what times what is 9. in this case, it is 3 for A and B. Then you go to BC=12 and 3 for B and 4 for C making it 12 So AC would equal 3x4.
I would say B for this question
Answer:
Rate=9.05%
Step-by-step explanation:
Let P represent the Principal ,t the time = 8 years and r be the rate of interest.
It is given money doubles in 8 years so A=2P.
The compound interest is given by the formula :

Substituting the values we have:

Dividing both sides by P :


1.0905-1=r
r=0.09050
r=9.05%
Answers ; you can you a quadratic formula because there is no other way
Step-by-step explanation:
It has square as its power so that the reason we need to use quadratic formula.