10-2: Test Prep

Edith bought a science book and a math book for her college classes. The cost ,s in dollars, of the science book is 28.75 more than the cost m , in dollars, of the math book. Write an equation that relates the prices of the two books.

A machine fills 75 bottles of water each minute. Write an equation to represent the number of bottles b of water the machine can fill in m minutes.

Ken said he would sell 30 tickets to the school play. Write an equation to relate the number of tickets t he has left to sell to the number of tickets s he has already sold.

Ken said he would sell 30 tickets to the school play.

If t represent the number of tickets he has left to sell and s represents how many he has sold.

Which variable is the dependent variable?

• s is the dependent variable
• t is the dependent variable

A 5-pound bag of organic brown rice costs $12.99. A 12-pound bag of the same type of rice costs $31.99. Which represent the better buy?

• The 5 pound bag is the better buy,
• The 12 pound bag is the better buy.