Cos theta = 817 where 0 £ theta < 90 Find cos 2theta

My math teacher told my class to "steal" a 6th grade fraction word problem from the internet, word problems? : -p requirements: only a 1 step word problem. needs to be complex.

How do you write 600 as a product of its prime factors (index! )

What is the slope of (0,32) and (100,212)