Answer:
Andre's Method is the only one that works
Step-by-step explanation:
Noah's method won't work because he doesn't follow the order of operations. You can pull the the 9 out first you have to distribute the 2 first.
Elena's method doesn't work because to eliminate the 18 you must use the reverse operation it must be added not subtracted.
yes, i know how to do it
C.
15 x 16=240 x 2= 480
57 x 20= 1140
1140 + 480 = 1620
