What is the definition of variable

Frankie is planning to buy a new MP3 player for $90. Each month he doubles the amount he saved the previous month. If he saves $3 the first month, in how many months will Frankie have enough money to buy the MP3 player?

If I run 26.2 miles in 1 hour 18 minutes and 27 seconds what is the average speed. Round to the nearest hundredths

A car traveled 687.5 miles in 12.5 hour at a constant rate. If distance is determined by the equation d=rt where r, is the constant rate in miles per hour, how far will the car travel in 16 hours?

The discount store is having a big sale. paper towels are two rolls for 1 dollar. disposable diapers are 3 dollars a box. if serena buys 2 rolls od paper towels and 2 boxes of diapers. how much change will she get from a 20 dollar bill?

A bowl has the shape of a hemisphere whose diameter is 14 centimeters. By itself, the bowl weights 350 grams. If it is completely filled with liquid that weights 1.

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.