Find the discriminant of each conic and classify it as a circle, ellipse, hyperbola or parabola. x^2-6y=21-2x+y

72-8y^2=-15x^2+9x-y

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

What statement is true? 2x^2-9x+2=-1

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500