Drew Christianson
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 Dec4 comment Geometric series So, to clarify, the sum in question is $X=\sum_{i=1}^{35} 1.05^{36-i}\left(\frac{1}{1.05}\right)^{i}$ ? Dec1 answered Is there a way to find precision used based on margin of error in compound interest problem? Nov26 answered Calculating credit card charges based on provided APR, balance amount and monthly payment amount? Nov26 accepted On the Origin and Precise Definition of the Term 'Surd' Nov26 revised Derivative I do not understand: $\ln (\ln x)$ parenthesis Nov26 suggested approved edit on Derivative I do not understand: $\ln (\ln x)$ Nov21 asked On the Origin and Precise Definition of the Term 'Surd' Nov14 accepted Probability of conditional inequalities of random variables Nov14 asked Probability of conditional inequalities of random variables Oct24 comment How to get/approximate distance between 2 close points (given in latitude/longitude)? Ultimately though, the formulas to calculate the precise distance (assuming a spherical earth) aren't too complex, what's your resistance to using them? Oct24 comment How to get/approximate distance between 2 close points (given in latitude/longitude)? Yes, but the scaling factor won't be constant as the distance per degree of longitude varies greatly. You could find the euclidian distance between two local points and compare against that. Oct24 answered How to get/approximate distance between 2 close points (given in latitude/longitude)? Oct6 awarded Scholar Oct6 accepted A Thought on Recursive Sequences Oct6 awarded Student Oct6 comment A Thought on Recursive Sequences @andre those are types of sequences that I led me to this thought. Probably just jumped the gun on something later in the course, but it would be cool if that property had a name. None as far as you know? Also, what are the suitable conditions? Oct6 asked A Thought on Recursive Sequences Oct3 comment Velocity word problem @jordan but you should be able to see ex post when your result is that the velocity is 0 at all time t that something is wrong. Thus, you take a step back, assume that to be false, and try something else. Hopefully some of this advice helps. The last thing I'll add: stick with it. It seems hard because it is, but it's hard because it's worth it. Oct3 comment Velocity word problem @jordan For me, the answers are: It's a point moving along a line, s(t) shows me where that point is at anytime time t. Knowing the position at every point in time means pretty much everything (velocity, acceleration, location, distance traveled, etc) follows from that. Moreover that function exists inside the logical framework of mathematics, within which I expect everything to be consistent. If I follow the rules anything that begins corresponding to reality should end corresponding to reality. Hence, you shouldn't 'know' ex ante you can't plug in h=25 before you differentiate Oct3 comment Velocity word problem @jordan Math can be frustrating, it's complicated stuff. Some of us here definitely make it look easy, but that's the product of decades of constant work. If it hasn't been your focus (which isn't bad in the slightest) it's just going to be a bit harder for you. The best advice I can give you is what everyone else has said: don't think about rules, tricks, etc. Instead, try to conceptualize everything you run. Here, the function s(t) = h is good example. What does it look like? What does it tell you about the point in describes? What follows from it?