Aparabola can be represented by the equation y2 = –x.
what are the coordinates of the focus and the equation of the directrix?
focus: (negative one-fourth, 0); directrix: x = one-fourth
focus: (one-fourth, 0); directrix: x = negative one-fourth
focus: (–4,0); directrix: x = 4
focus: (4,0); directrix: x = –4

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.