Is this a quadratic functions x = 3y2 – 6y + 5

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

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”?