Can someone me with #2 and i made it clear as possible

Find the required measurements of the following trapezoids. a = 8 cm b = 16 cm h = 10 cm

What is the definition of exponential decay?

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 (%)