Answer:
Rate = 10%
Step-by-step explanation:
We are given with the following details.
Interest earned = $ 116.25
Principal = $ 1550
Interest Rate = r (say)
Time = 9 months
= 
We are asked to determine the rate of interest for which we can earn 116.25 interest. As we are not specifically given whether it is a compound or simple interest , we assume it to be simple interest and solve .
The formula for simple interest is given as



r=0.1
Hence the r = 0.1
Hence the rate of interest is 10%
Answer:
The population in 2017 is 171 million
Step-by-step explanation:
Let's assume population starts from 1991
so,
initial population is 147 million
so, 
we can use formula

we can plug A=147

In 1998:
t=1998-1991=7

now, we can plug these values into formula and find k

Divide both sides by 147





now, we can plug it back
and we get

In 2017:
t=2017-1991=26
we can plug it and find P


So,
The population in 2017 is 171 million
Answer:
True, for Probability of a chance event certain to happen is 1.
Step-by-step explanation:
Given that,
A chance of event with probability of happening certainly is 1.
To find:- Is it true or false?
from the given scenario,
Probability states that P(Event) is a number describing the chance of that event will happen And value of
lies between
..

When An Event is certain to occur then its
.
when An Event cannot possible to occur then its
.
And
Is there any chance that event will occur then its value lies
.
Let us take an Example:-
- If it is Saturday, then the probability that tomorrow is Sunday is certain, therefore the probability is 1.
- The probability that tomorrow is Friday if today is Sunday is 0.
Hence,
True, for Probability of a chance event certain to happen is 1.