book Maths Puzzle Numerical Ability

Use the Gauss Jordan method to solve the system of equations:
x+y+2z=7
3x-y+z=10
2x+y-3z=-6

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book Other Question

Hello,

My name is Kristin and my time for the college placement exam is approaching and I need help!!!!!so please help


THE SQUARE OF 50p^16q^8=

THANK YOU IN ADVANCE,
KRISTIN
Yikes nobody I know knows this stuff. Please Help
Thanks bunches.

2/3y + 4 = 2x

secondly


1/2(y + 5) + 4x = 3x