exam Maths Puzzle Numerical Ability

Solve the following 2 x 2 systems using substitutions

3x - y = 5
6x + 5y =-18

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exam Other Question

The manager of an orange grove is trying to decide when to pick the oranges. If they are picked now, the average yield per tree will be 80 kg, which can be sold for $1.20 per kilog Can you help me factor by grouping the following?
x^3 + 3x^2 + 4x +12

I think the answer is: x (x^2 + 3x +4) + 12. Am I on the right track?

Thank you for your assistance.