Official SAT Math IIc October Discussion

<p>lakshmi52, #49 was the pet's dish question (surface area)</p>

<p>for the probability one with the letters and numbers i put 5!/4! * 10!/5! ....i might have misread it, but i think the question was how many codes can be made using 1 of the 5 letters and 5 of the 10 numbers. If the question was how many combinations using all 5 letters, then 5! would be right and i got it wrong :(</p>

<p>the sin x = t question appeared in the official sat 2 book, i think it was the may 2002 administration, don't ask why i know this :P</p>

<p>don't know to cancel or not....
so im gonna see if i can predict my score lol.
ques. i remember: (who remembers all 50?...)
1. x=1/(3-rad5)^2 what does x=3-(1/x)^2 =? i got: 5
which graph has b^2-4ac <0, i chose e). graph under the origin
for the heartbeat i chose 120 too, but i think its wrong, cuz sin(2pi*t) has a period of 1. so it should be like 367.999 was that a choice?
surface area pet's diish i said 127(a)?
cosx=-rad1-sinx^2 true for what thetas, i said 2nd + 3rd quads?
t/rad1-t^2
for if this is f(x), which is part of graph of f^-1(x) inverse, i said graph a)
which is a root of eqn x^2-(6)(7)x+(6)(7), i said a root is 6 c)
5! * 10!/5!
for one like sintheta=0.7134 what's csctheta, i said 1.40 or something
rosa b/w j and pablo
seven employees, eighth comes in w/ higher salary, i said the new mean is higher than 41,096 (a)
the thing with dots and asks for the eighth term, i said 92
which is center of ellipse with eqn something, i said e) (5,-3)
which of these has f(x) greater or equal 0 all reals, i said only I and II (d)
vertical asymptote of x/3x-4, i said 4/3
line perpendicular to plane, 4 units from plane, 3 from line = 4 points e)
triangle gave you 3 sides, asked for angle S, i said like 50.7 degrees
start with 100, exceed $300, equals 24 years d)
record artist gets what final amt in dollars, i said 0.2(75+0.15n)
what's the length of the long diagonal of rectangle solid, i said rad(85+3^2) = rad94 = 9.70
what's slope of two points (1, f(1)) and (3,f(3)), i said radsomething/2
what's h(f(g(4))), i said 7 c)</p>

<p>oh and for the annual salary mean,median question, new mean is greater than original mean?</p>

<p>Yup, the new mean would be greater than the original one.</p>

<p>so far i have 5 wrong...anyone remember more?</p>

<p>@wendyling</p>

<p>agree except for pet dish (too low), didn't do heartbeat, i messed up the law of cosines one but that sounds right</p>

<p>for petdish was it #49? was there an answer choice between 268 and 332?</p>

<p>oh and i thought two circles made up that spacial set of points</p>

<p>anyone agree with me that it was 5!/4! * 10!/5! ?</p>

<p>or did i misread the problem.....did it say a combination with ALL five letters or ONE of the five letters?</p>

<p>Ummm. could some one please expain the heart rate question. I though it was the period time 60 and the period was one so I got 60.</p>

<p>And if one gets 3 wrong and 2 omits is that def. and 800 or not?</p>

<p>i got 4 points, because it said 4 units from a plane, which is 2 planes. then 3 units from a perpendicular line, which is 2 lines. 2 planes and 2 lines that are perpendicular intersect at 4 pts, right?</p>

<p>btw did everyone get same answers as me for ques i posted?
who remembers the rest? thx. i might cancel :[</p>

<p>i put 60 for the heartbeat question too cuz it said that there is one heartbeat for every period and since the period is one, there is one heartbeat per second and thus 60 per minute. Did i read the question wrong? </p>

<p>Also, i thought it said that 5 numbers and 5 letters would be used in that question. Did i read that one wrong too? :(</p>

<p>oh and wendyling, i wouldn't cancel. i agree with all of your answers except the heartbeat one and i skipped the dot question so i don't know about that one.</p>

<p>and 3 wrong and 2 omits is definitely an 800.</p>

<p>initially, i thought the plane&line question's answer was 4 points.. but if you think about it, its just two circles parallel to the plane, each 5 units above and below and with a radius of 4(all of the points 4 units away from the line)</p>

<p>and the heartbeat question... totally confused</p>

<p>Combination was 5 letters with 5 numbers</p>

<p>it was 5! x 10!/5!</p>

<p>Ooops, I just realised there were 50 questions .... agh, I thought there were 35. Or maybe I did 50 but just can't remember ....</p>

<p>does anyone remember exactly what the heartbeat problem said?</p>

<p>something about sin(2pi*t) with t being time in seconds..
something about how many heartbeats were in a minute?</p>

<p>Heart one was not 120. That's the TRAP answer. It was sin(2PIt) at the end of the equation.</p>