A triangle is rotated 90° about the origin. Which rule describes the transformation?

(x, y) - (- , -y)
(x, y) - (-y, x)
(x, y) - (-y, -x)
(x, y) - (1, -x)

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?