Find the output k when the input x is -5

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Consider the function f(x)=-5x+3 what is f(-2)

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 (%)