What is x>8,x<0 written in interval notation?

Can someone 50 first drop menu 0.80 or 0.75 or 1.20 or 4.00 second drop menu 4.00 or 0.75 or 0.25 or 3.75 3rd 15,6,10, or 9 4th yes or no

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left