2 meters is equal to 200 centimeters
Divide 200 by 10
200/10 = 20cm
Each piece will be 20 cm long
So your answer is A
I assume you mean to ask how to find the sum of the seven terms?
You have
![a_2=ra_1](https://tex.z-dn.net/?f=a_2%3Dra_1)
![a_3=ra_2=r^2a_1](https://tex.z-dn.net/?f=a_3%3Dra_2%3Dr%5E2a_1)
![a_4=ra_3=r^3a_1](https://tex.z-dn.net/?f=a_4%3Dra_3%3Dr%5E3a_1)
...
![a_7=ra_6=r^6a_1](https://tex.z-dn.net/?f=a_7%3Dra_6%3Dr%5E6a_1)
So the sum is
![a_1+ra_1+r^2a_1+\cdots+r^6a_1=a_1(1+r+r^2+\cdots+r^6)=a_1\times\dfrac{1-r^7}{1-r}](https://tex.z-dn.net/?f=a_1%2Bra_1%2Br%5E2a_1%2B%5Ccdots%2Br%5E6a_1%3Da_1%281%2Br%2Br%5E2%2B%5Ccdots%2Br%5E6%29%3Da_1%5Ctimes%5Cdfrac%7B1-r%5E7%7D%7B1-r%7D)
You know that
![a_1=-11](https://tex.z-dn.net/?f=a_1%3D-11)
and
![r=-4](https://tex.z-dn.net/?f=r%3D-4)
, so the sum is equal to
If you divide each number by the previous one, you get:
-86 / -172 = 1/2
-43 / -86 = 1/2
-21.5 / -43 = 1/2
The common ratio is 1/2 = 0.5
It is B Because you are finding the intrest rate which means find the rate first hen subtract the actual rate to the interest rate<span />
Answer:
ammmmmmmmmmmmm what's the Question?