Been studying for my Math 131 final. It's kind of hellish, especially since our professor is insisting on teaching us new material right up until we take the final exam, which we take the very last day of the semester. We're currently working on inequalities. But, that's why I've been quiet. 

More of a post will follow but in the mean time, look at the below word problem, and see if you can figure it out. I'll be posting the answer after my final. 

"I have 400 grams of Kryptonite. Kryptonite decays continuously at a rate of 4.5%. Fortunately, it only takes 50 grams to kill Superman. But I need a lot of time to plan my fiendish plot. How much time do I have before the Kryptonite reaches the minimum dose? 

Hint: The mathematic constant e measures continuous growth or decay at exponential rates. So, you want a formula that looks like this: where K is the amount of Kryptonite, t is the time, and r is the rate of decay.

My math professor loves to give us word problems. Applications of mathematical concepts to real-life, every day scenarios. And that's great! Learning how to apply math that you learn to the real world is important - it's why math was created in the first place.

Trouble is, he likes boats that go up and down stream. And every time I see one now, I flinch. More...