Eighty percent of the castles had been preserved. if there were 135 castles in all, how many had not been preserved?

Hamish rides his bike at an average speed of 22 km/h. How far does he ride in: 1. 2 1/2 hours? 2. 3/4 of an hour? 3. 15 minutes?

How to combine like terms in the expression

Is 1/8 irrational or rational

8 12/15 to the next whole

James has 5 friends who are available to go to a baseball game with him, but he only has 2 extra tickets how many different choices does james have for which 2 friends to invite

What is 5,000 in scientific notation?

Which of the following is correct set notation? (1,2,3) 1,2,3 {1,2,3} none of the above

The kindergarten teacher wants to divide 1/2 of her classroom into 5 equal sections for stations

A train traveling at 30 miles per hour reaches a tunnel which is 9 times as long as the train. If the train takes 2 minutes to completely clear the tunnel, how long is the train in miles? (1 mile = 5,280 feet)

The cost for 7 dance lessons is $82. the cost for 11 is $122. write a linear equations to find the total cost C for L dance lessons. How much for 4 lessons?