To find the answer, use
, and then use the equation
To find it's half life.
Answer:
34.83
Step-by-step explanation:

For each time period, each time "t" increases by one, the population will be multiplied by 4.
A) AED 4000
4000 x .10= AED 400 therefore 400 is 10% of 4000
Answer:
22 hours (B)
Step-by-step explanation:
John's velocity = 55mph
Sally's velocity = 65mph
John's time taken = x
Sally's time taken = x - 4
since they must cover the same distance.
and, distance = vel × time
Sally's vel × time = John's vel × time
55x = 65(x-4)
55x = 65x - 220
-10x = -220
x = 22 hours.
Therefore, Sally catches up after 22 hours