How do u add and subtract mixed numbers 2 6/25-1 1/10

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 always true when two whole numbers are subtracted?

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x