Given the points a(0, 0), b(e, f), c(0, e) and d(f, 0), determine if line segments ab and cd are parallel, perpendicular or neither.

a. parallel
b. perpendicular
c. neither

In the triangle abc< angle c is a right angle. find the value of the trig function indicated. find tan a if a =12, b=5 a. 13/12 b. 12/13 c. 5/12 d.12/5

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

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?