Determine whether each system of equations has no solution, one solution, or infinitely many solutions Show work please:)

What is the value of x? enter your answer in the box. (cm)

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

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 (%)