If a burger is a sandwich then why is it called burger even though it's a sandwich?

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 (%)

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

How many 3/8s are in 6 plz someone tell me now