Julia buys 12 books. She gives 9 books away. how many books does she have left?

A long distance phone company charges $1.01 for the first 25 minutes of a call, and then 99 cents for each additional minute. A call costs $9.56. How long did it last?

For every ton of paper that is recycled, 17 trees are saved. Discrete or continuous?

What is the expression for Keq for this reaction? 2H2O (g) 2H2 (g) + O2 (g)

Which ratio best defines experimental probability? Number of times an event occurs: Total number of times the activity is performed Total number of times the activity is performed: Number of times an event occurs Number of nonfavorable outcomes:

Lydia decides to provide cheddar cheese for the competition. She buys 4.2 kilograms for 39.90. She estimates the cost of 1 kilogram of cheese to be $1. Is her estimate reasonable?

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.