exam Maths Puzzle Numerical Ability

I am having trouble factoring 6x^6-24x^4+18x^2---I cant figure out what to begin with when I start to factor. Should I take out a 3x^2?

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exam Other Question

solve each system of equations using any method
a. 15x+11y=132
2x+ 3y= 59

b. -18y=18-3x
y=4x-47

complete and write in lowest terms.
8a/8 - 6a/32
7g+8/3 + I dont understand how to start the problem or finish it either.