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yeah the tank thing is what i was referring to just called it chem cause reminds me of chemistry but yeah i think they might

on how to draw it, it depends on what domain you decide on, because you have to be either left of the vertex or right otherwise you fail the horizontal line test. the intersections though all functions and their inverses intersect on y=x, but since only half the parabola is chosen only 1...

any thoughts on a logistic equation being the chemistry one (mixtures)

yeah when i meant less then expected was meant to say like answered differently/incorrect compared to what the examiners had thought in the first place, not left blank

i think it depends on what the state does (this could be completely wrong) but i remember hearing that if questions are answered less then expected by the examiners they change up what they thought was the marking criteria

yeah the limits were a pain but leaving them in arccos and then evaluating in the end it worked out to be a bunch of fractions and then 136/5

yeah i can see how wolfram and others did it with that specific substitution (probably easier then how i did it) but was wondering if using a trig substitution that of 3sectheta and still getting 136/5 is still considered full marks given the weird limits of root 13 and 10

i would agree, just making observations the best way to do well is to know everything well

i think we will get proj motion still just in reference to q14, would they have the same "area of a topic" in both the hardest questions of x2 and x1?

yeah but i feel as if its something maybe was more used in the old syllabus, cause ive rarely seen questions on the triangle inequality (100% could be wrong though)

yeah thats what ive seen it as, just when they made it into 3d i just forgot everything about it lol

honestly doubt projectile motion after having that in x2, and considering vectors last year were like non-existent probs a vector proof

my trials perms and combs was q11a) literally 3 marks and it was like 1 person already chosen how can the rest be chosen if there was 10 and you want like 4 more

bro i saw it and instantly though, triangle inequality in 3d really? never seen that before maybe i just got really unlucky not every seeing it

all im saying if x1 is majority perms and combs

yeah q15 was easier i agree, i didnt do it the way the mods on here did it, i let c=ab for memory but every worked out fine. q16 though literally didnt spend like anytime on the triangle inequality in study so when i saw it...

yeah i think in the moment i thought it was a lot harder then looking back at it now, but still q16 and q15 proof topic, compared to last years proofs cant believe they got prove (a-b)^2>0

really hoping e4 is lower then last year then it might be possible by the looks of these solutions

idk just didnt expect 243, kept with it cause time wise but i already accept a defeat when there is definite integrals i always evaluate wrong

also is all the net force required for 14b? like i just did down the slop being perpendicular to the slop and it got the same answer