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.
2(a-b)
this is the answers
Using first the customary ruler and then the metric ruler, measure the length of the side of the wooden block. Remember to estimate to one place value beyond the rulers’ gradations.
Answer:
Step-by-step explanation:
(-4+4)/2 = 0/2 = 0
(4+8)/2 =12/2= 6
(0, 6)