exam Maths Puzzle Numerical Ability

what are the three types of linear systems

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exam Other Question

Multiply:
3s^2 * 5s^7

Is the answer:
15s^14?? Thank you so much!
For the quadratic equation x^2 + kx +7 =0, if 3+sqrt2 is a root, what is the value of k ?
I said 6 but my teacher marked it wrong. Please help me :)