<p>what was the answer to the minimum of sand question?</p>
<p>a lot of people put t=0 (2500) but claimed they were wrong. ironic. but yeah. any input?</p>
<p>there was time (at 5 second or so) when the amount of sand was something less than 2500. I think you just had to subtract two equations and set it equal to zero.</p>
<p>Yeah, there was a value that equaled 2492.something, I think...</p>
<p>i don't remember 2492. i got 2487 or something in the 2480's.</p>
<p>For the minimum amount of sand question, I just did this...</p>
<p>Y(5.118) = 2500 - fnInt(R(t),X,0,5.118) + fnInt(S(t),X,0,5.118) = 2492.369 yards^3</p>
<p>This question did seem odd to me, because I expected a much smaller number than that ... that answer is only, what, ~7.631 away from the amount of sand on the beach at t = 0. However, I suppose since you have addition and subtraction of the sand, there really shouldn't be that much of a difference from the original amount.</p>
<p>i got 2492 as well. I had like 20 for S(t) and 28 for R(t)... it was where the two graphs intersected i think, cos its from Y(t) = 2500 + Int (s(t) - r(t))... y'=0.... so s(t) = r(t)... intersection... but I was totally fry'd, not even sure if thats right now.</p>
<p>SAME I GOT THAT>..... YES! I Don't think i got the wire problem though.... igot 50 ish</p>
<p>Anyone else have any comments on my answers? I will re-edit the answers for corrected in a bit; just waiting for more comments/correct answers. Overall, I think I did pretty well, thought not amazing, on the FR. Probably around 40 or so points - hopefully on my way to a 5.</p>
<p>crypto you cannot leave the differential equation as y^2=... you needed to take the square root of both sides and since the initial condition was -1 you needed to make the square rooot negative.</p>
<p>i thought the test was pretty easy.</p>
<p>I thought it was really hard because I had a sub all year.</p>
<p>free response answers</p>
<p>ok for the mvt problem i think it did not apply cuz the question mentioned the interval as open not closed just that violates the mvt</p>
<p>did anyone notice that the May 20th AP Calc FRQ answers are postedd...</p>