math
posted by Ashley on .
a 6' person is standing x feet away form a 10' lamppost. what is the distance d from the base of the lamppost to the end of the person's shadow, expressed as a function of x

Make a sketch and notice the similar triangles.
by ratio:
d/10 = (dx)/6
6d = 10d  10x
4d = 10x
d = (5/2)x