It would be: 28*15 / 100 = 420 / 100 = 4.2
Answer:
x = 1, y = 1
x = -2, y = -8
x = 3, y = 7
Step-by-step explanation:
Answer: $12
Step-by-step explanation:
The formula to calculate the compound interest , if the interest is compounded semi-annually :-
![A=P[(1+\dfrac{r}{2})^{2t}-1]](https://tex.z-dn.net/?f=A%3DP%5B%281%2B%5Cdfrac%7Br%7D%7B2%7D%29%5E%7B2t%7D-1%5D)
, where P = Principal amount
r = rate of interest ( in decimal)
t= Time ( in years)
Given : P= $1500
r= 1.6 % =0.016
t= 6 months = 
year [∵ 1 year = 12 months]
Then, the interest earned by Robert in 6 months will be :-
![A=1500[(1+\dfrac{0.016}{2})^{2\cdot\frac{1}{2}}-1]](https://tex.z-dn.net/?f=A%3D1500%5B%281%2B%5Cdfrac%7B0.016%7D%7B2%7D%29%5E%7B2%5Ccdot%5Cfrac%7B1%7D%7B2%7D%7D-1%5D)
![A=1500[(1+0.008)^{1}-1]](https://tex.z-dn.net/?f=A%3D1500%5B%281%2B0.008%29%5E%7B1%7D-1%5D)
![A=1500[1.008-1]](https://tex.z-dn.net/?f=A%3D1500%5B1.008-1%5D)
![A=1500[0.008]=12](https://tex.z-dn.net/?f=A%3D1500%5B0.008%5D%3D12)
Hence, Robert earned $12 as interest .
-4 is also a geometric mean
if we consider a(first element in series)=1 and r(common ratio)=-4 then the series would be
1,-4,16,-64,256,…..,a(-4)^(n-1 )
where n is nth term
from this -4 would be the geometric mean if we consider -4 as common ratio .
If we consider 4 as common ratio then geometric mean should be 4
so you should mention whether common ratio >0 or not (r>0 or not) .
[without ‘r’ value you can’t solve the question but in general most of the teachers will consider r>0.]
So, -4 won’t be geometric mean of 1 & 16
Wouldn’t it be 46:2 and also 23:1?
