Brian goes to school 6 hours per day, works 4 hours per day , and sleeps for 9 hours per day. What is the ratios of hours brain sleeps

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 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 (%)