exam Maths Puzzle Numerical Ability

Solve the system by addition or substitution.
10x-5y=17
y=2x-3

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exam Other Question

I need some help on this

Evaluate. 3 � 62 - 8 � 7= hi, i have this math problem where i need to find the domain of f(x) when it equals the square root of (x^3-7x^2-18x)

thanks!