What is the greatest common factor of 27

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0