exam Maths Puzzle Numerical Ability

9x-10 + 2x^2 + x^2+4 Triangle perimeter

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exam Other Question

An item costs $1300, has a scrap value of $100, and a useful life of six years. The linear equation relating to book value and number is years is_____? can you help me solve this problem

Solve and write the answer in set notation
/3x-6/>3

Here is my answer
3x-6>3 3x-6>-3
3x-6+6>3+6 3x-6+6>-3+6
3x>9 3x>3
3x/3>9/3=x>3 3x/3>3/3=x>1

{x/x>3}