Tara bought 30 books at a yard sale. She now has 220 books. Which equation can be solved to find b, the number of books Tara had before the yard sale?

Which trigonometric function has the same value as sin 75? cos 75 cos 15 sin 15 tan 75

Kristel is considering hiring a moving company. Sanford's Plus charges an initial fee of $125 plus $165 per hour. Quality Moving Company charges an initial fee of $200 plus $145 per hour.

Write your own problem. Choose a secret number. Write clues about the number using the words is greater than and is less than.

Is this expression contain a variable? 7+15n

Cameron is designing a calendar as a fundraising project for math class. The cost of printing is $500, plus $2.50 per calendar. Cameron estimates the math class will sell 200 calendars.

Five times a number x minus 9 is two thirds of a number y. What is the equation?

The maximum weight an airline allows for a suitcase is 50 pounds. Ella's suitcase weighs 8 pounds empty. If Ella meets the requirements, what could be the weight of the contents of her suitcase?

A flight instructor charges $50 per lesson, plus an additional fee for the use of his plane. The charge for the use of the plane varies directly with the square root of the time the plane is used.

What is an estimate of the value of 0.0000000055 as a product of a single digit and a power of 10?

How do you solve (a-1) - (a+2) - (a-3) = a