Simplify the following expression. 3x ^ 4 + 2x ^ 3 - 5x ^ 2 + 4x ^ 2 + 6x - 2x - 3x ^ 4 + 7x ^ 5 - 3x ^ 3

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?

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?