What is the solution to the system of equations -x+2y+2z=0, -x-2y-2z=0, x-z=-1

The value √10 and √15 are plotted on the number line

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

Aculinary club earns $1360 from a dinner service. they sold 45 adult meals and 80 student meals. an adult meal costs twice as much as a student meal. what is the cost of an adult meal?