Answer:

Step-by-step explanation:
We are given with two equations
first equation is 
second equation is

we find the result of subtracting two equation
subtract the second equation from the first, so
first equation - second equation, multiply second equation by -1 and then add it with first equation


Now add both equations, we get

Answer:
I think, yes?
Step-by-step explanation:
It is an irrational number. The first 10 digits of pie are 3.141592653. Hoped I helped. :)
Define the population, decide on the sample size (aka what percentage of that population)