2.526 - 3.628 = i know there is a calculator for this but i need to show it in work so PLEASE RESPOND! (Thanks if u do)

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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