Answer: 6.93 years
Step-by-step explanation:
Given
Rate of interest is 
Future value is given by 
For the investment to double itself, i.e. 

It takes around 6.93 years to double the investment.
Answer:
25
Step-by-step explanation:
-25 to 0 is 25 and 25 to 0 is 25
Opposite of -25 is 25
So lettter d
Answer:
X ≥ 10
Step-by-step explanation:
Answer:k=1,k=-2,k=
Step-by-step explanation:
Given two vectors


Distance between them is given by

squaring both side



k=1

angle between u and v is 90 i.e. orthogonal

=0
2+k=0
k=-2

angle between u & v is 





=0
k=