There are 20 people in Susan's class. Each person gives a card to everyone else in the class. How many cards were exchanged?

If I am 9 to my number, I get 6. What is my number?

In a recent year, 22 percent of email users said they spend less time using email because of spam. what fraction of email users is this

What is the median of 4,17,17,4,27,29,20,24,34,4

Raphael paid $648 for a camera during a 20% off sale. what was the camera's regular price?

The circumference of the circle-shaped rug is 56.52 inches. What is the area of the rug?

Assume running consumes 108 calories per mile. If you run 11 - minute mile what is your average power output, in watts, during a 2-hour run?

You find that your watch gain 2 minutes in 6 hours. how will it gain in 3 days?

A car traveled 27.5 miles in 30 minutes how many miles per hour was it travel

In a marketing class of 60 students, the mean and the standard deviation of scores was 70 and 5, respectively. Use Chebyshev's theorem to determine the number of students who scored less than 60 or more than 80.

A store sells a television for $1000. Customers can choose to receive a 10% discount and pay it off with a loan at a simple interest rate of 4%, or they can choose to pay full price and pay it off in 3 years with no interest.