The diagrams show a quadrilateral ABCD. Is AB parallel to DC? you must give your reasoning.

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

What is the absolute value of the complex number -4-sqrt2i

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