Please help fast! Calculate the mean and explain the mean that would signify the entire population of fish by using this sample

Which property is illustrated by the statement given below? raj raj.

What is the value of x when x + 7 = 21?

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36