exam Maths Puzzle Numerical Ability

How do I solve the following equation?

Linear equations

3x-2y+2z=-30
x+3y-2z=12
3x+2y-z=-6

Thanks for your help,
Zachary

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exam Other Question

Multiply

8pq^2(2pq-3p+5q)

Thank you, These problems have me so confused. Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences int he rate at which each function changes with increasing values of x.

f(x) =