Flavia bought a pair of rollerblades. The regular price was 129.50. They were bought for 40% off and the sales tax was 15%. Show all the steps...

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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.

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?