7) Christine tried to find the solutions to the system below, and her work is shown. x + y +z = 6
2x + z-y = 3
3x - z= 0
rref 2
3
1
1
1
1
- 1
- 1
6 11
3 = 0
0 0
0
1
0
0
0
1
- 31
9
0
Christine is unsure of her error because when she substitutes her solutions in for the "check" it does not
work.

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x