A camera is marked down from $36 to $27. What is the amount of the markdown? What is the percent of the markdown?

What is the distance between point a and b

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.