book Maths Puzzle Numerical Ability

1. Use Cramer's Rule to solve for z.

3x+2y-z=17
2x+3y-z=15
2x-3y-z=-3

2. Solve the system:
2x+y+3z=-5
y+z=3
4x+3y+7z=3

3.Find the values of A and B in the following

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book Other Question

I am trying to home school my son and I am having difficulty in explaining the steps for this quadratic equation problem in completing the square.
0.4x2 + 1.1 =2
I know that you have to multiply the decimals by 10 to get rid of the decimals. Please help me answer the question: Find the center of the circle with the equation {{{x^2+y^2-4x+6y+1=0}}}