What are the mean, median, mode and range of the data set given the altitude of lakes in feet -12 -9 -14 -39 -49 -18 and -43

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.