One-third of the students in a class are under the age of 20. If there are 9 students in the class that are under the age of 20, how many total students must be in class?

A large coffee urn dispenses coffee at a hospital cafeteria. The cafeteria is open from 6 am until 7 pm daily.

97 1/2% of what number is 351?

Helen is looking at her online bank account summary and sees a money transfer for + $250. Which of the following best describes + $250?

A lot of research is conducted on the sleeping habits of U. S. adults. One study reported that X, the amount of sleep per night of U. S. adults follows a normal distribution with mean μ=7.5 hours and standard deviation σ=1.2 hours.

For every 8th pitch tom throws he strikes out 5. how many strikes if he throws 30 pitches

Two companies make batteries for cell phone manufacturers. One company claims a mean life span of 2.5 years, while the other company claims a mean life span of 3 years (assuming average use of minutes/month for the cell phone).

Simplify the following expression: 5x-6y+5z-x-12y+2z

Jessica wants to buy a guitar. she has enough money in her bank accounts to pay cash for a new guitar for 1150 or a used guitar for 500. jessica wants to choose the guitar that has a better impact on her net worth.

What is 3.5 in fraction form

The range of which function is (2, infinity) ? y = 2x? y = 2 (5x) ? y = 5x + 2? y = 5x + 2?