Use the elimination method to solve the system of equations. choose the correct ordered pair.
- x + y = -3
3x + 2y = 9
a. (3,0)
b. (6,3)
c. (5,2)
d. (4,1)

Flashback to semester a. are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr? show your work.

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

A. s.a.! similarity in right triangles, refer to the figure to complete this proportionc/a = a/? a.) cb.) hc.) rd.) s