Plz will give

a teacher would like to estimate the percentage of her students who play chess.

which method should the teacher use to select the sample?

use a computer to randomly select 30 student ids from all her students

select every other student in her classes until she has selected a total of 30 students

use a computer to randomly select 30 student ids from all students

select all students who are currently in the chess club

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.