Zipote wrote:"New rule!.....Markr has to wait at least 3 hours after a question before posting an answer!"
Hey, Rap has three hours on me! You're probably just kidding, but at another site that I frequent, they have a hide feature. It allows others to view the problems without seeing answers. My responses with white text and a small font are an attempt to hide (for those who don't want to see) my answers.
Tryagain wrote:Mark is our resident in-house genius, although he is too modest to claim such a title. However, even the mighty have been known to trip over an occasional corn dog.
?'BD+DF=5'
I'm no genius, but I do know that if Try says I'm wrong, there's a decent chance I'm not.
<----A(-3)----B(-2)----C(-1)----0----D(1)----E(2)----F(3)----4--->
?'BD+DF=5'
BD = 1 - (-2) = 1 + 2 = 3
DF = 3 - 1 = 2
3 + 2 = 5
Notice that Rap took the same approach (although he arrived at different results

).
Perhaps instead of distance BD + distance DF, you meant (here we go again!) B*D + D*F.
In that case,
BD+DF = (-2) * 1 + 1 * 3 = -2 + 3 = 1.
I suspect this was intentionally made vague. :wink: