How can u find the median if there are two numbers left in between? look at the pic (question 5)

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

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 (%)

Can someone answer this question for me