exam Maths Puzzle Numerical Ability

1. A retired couple has $130,000 to invest to obtain annual income. The want some of it invested in safe Certificates of Deposit yielding 5%. The rest they want to invest in AA bon

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Can someone please help me solve this linear system in three variables?

x-3y=11
5y+z=4
-x+z=2
{(?,?,?)} 8y^3 + y^4 + 16 + 32y + 24y^2
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y+ 2