book Maths Puzzle Numerical Ability

find factors of 12x^2n+11x^n-15

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book Other Question

20=1/10r ( find value of r) Solve each system by the substitution method. Indicate whether each system is independent, inconsistent, or dependent.
x - y = 3
3x - 2y = 3


3y = x + 5
3x - 9y = -10


x