For what values of the variable is the expression below undefined? 5z+6 / 6z^2-6z. PLEASE HELP!

What is the rule for reflection across the y axis

How many solutions does the nonlinear system of equations graphed below have?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?