exam Maths Puzzle Numerical Ability

FACTOR THESE Completely? :

1) 6x^2 - 28x + 16

2) x^4 + 2x^3 - 3x - 6

3) x^8 - 1

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exam Other Question

Solve by the elimination method.
x+6y=45
-x+4y=15
What is the solution of the system? Hello, I am currently attempting to correct questions from an exam in my algebra class. I would greatly appreciate any help. The problem is as follows:

y-2/y + 2/y = y+1/y-3