Solve for x, y, and z.
X+y+z=4
4x+1/2y-3z=30
-2x-6y+5z=-7

Which system of linear inequalities is graphed? can somebody pleasssse

What is the standard form of -5x^2+2x^4-11+x^3+3x

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