Increase £500 by 3.2% how do you work it out

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.