What is 20 + 1,200 i need a answer

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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 (%)