exam Maths Puzzle Numerical Ability

Evaluate. | -14 | - | -11 |

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exam Other Question

Please solve this problem: (3x-2y)squared

Answer sheet says it 9x squared+4y squared-12xy.

I understand the 9x squared + 4y squared but not the -12xy.

Thanks,

S A store sells an item for 4/5 of the cost paid by the store plus the cost paid by the store. The idtem sells for $6.30. How much did the store pay?