At this point, the questions are up to you... just give we a PAGE NUMBER AND PROBLEM NUMBER when you ask a question. Feel free to look at old Problem Sets as well.
I will be in school by 7:30am Tues and Weds if anyone wants to drop by... (possibly a little earlier on Weds)
There will DEFINITELY be a "mixture" problem on the test, which is nothing more than solving a system of equations. See pg 384 problem #2 and pg386-88 #22,23 and pg 407#15.
ReplyDeleteI'll post the answers below (DON'T LOOK!!!)
Answers )don't look yet!!!):
ReplyDelete#22: 2.1 oz of Perfume A, 0.9 oz of Perfume B
#23: 66.66 mL of the 5% mixture and 133.33 mL of the 6.5% mixture
#15: 80 L of the 30% insecticide, 120 L of the 50% insecticide
I'll actually be in to school by 7am or so tomorrow...
ReplyDeleteI will try to come in tomorrow!!
ReplyDelete#23, page 387
ReplyDeleteI don't know how I did this.. But after substituting x=200-y into my other equation, .05x+.065y=.06, I ended up with y+ -165.66666..
Same for #15 on pg 407..
ReplyDeleteI substituted my equation of x=200-y in my other equation .3x+.5y=.42, and ended up y= -297.9.. And it doesn't really seem to make any sense at all.
Woops, for 1st anon comment, I meant "I ended up with y=-165.66666..."
ReplyDeleteI was watching a video tutor on this.. And it said 30% acid solution, but the tutor put down .7 next to the variable instead of .3.. I don't understand why!
ReplyDeletehttp://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-235s.html
On Page 709, #3, I am confused on where to start. Would you F.O.I.L. (x+2)(x+1). I tried that but I got nowhere with it.
ReplyDeleteNow that you mention #3 on pg 709.. I have no idea how to even start figuring out that problem!
ReplyDeleteHow do you solve #5 on pg 709, with an integer over a fraction?? I forget!
ReplyDeleteFor 709#3, you need a common denominator. The BIG FAT ONE (BFO) for the first fraction is (x-3)/((x-3) and the BFO for the 2nd fraction is (x+4)/(x+4), yes?
ReplyDeleteFrom there, you just simplify the numerator... our book likes to "re-factor" when they are finished simplifying, you'll have to be flexible tomorrow on the EOC.
btw, do you see which answer choice can be ruled out entirely right from the start? (I hope so).
Wait, Mr.C, will you be at school tomorrow at 7:30 or 7:00 am?
ReplyDeleteDear 30%,
ReplyDeleteMaybe I'll check the video tutor later, but if a solution is 30% Acid, that means it is 70% "other"... so my guess is you can solve in either direction.
Liquid mixture problems will involve only two variables, an identified component (like acid) and the remainder (sometimes idnetified i.e. water, oil, etc. sometimes not).
Can you cancel factors on a fraction subtraction problem?
ReplyDeleteSuch as {[(x-4)(x-3)]/x-2}-{[(x-2)(x+4)]/(x-3)]} ?
Would you be able to cancel out the (x-3) and the (x-2)?
bbl 7:30ish
ReplyDeleteOh, okay.. So I can come at 7:30 tomorrow morning? Will that give us any time to do review any questions?
ReplyDeleteDo we have to know "Simple interest formula"? Because I looked up the 8th Grade Ask Reference sheet and it has the simple interest formula..
ReplyDeleteMr.C-- Is the Volume of a sphere 1/3πr^2 or 4/3πr^2?
ReplyDeleteHow do you solve #24?
ReplyDeleteWoops, sorry, that #24 is from pg 710. And I also need help solving #22..
ReplyDeleteAlge-chat, anyone?
Let's not over-stress and over-cram tonite... a few review problems should do the trick... even just perusing the problem sets would do an algebra-tician some good. Yuzel all do just fine!
ReplyDeleteI'll bet volume of a sphere will NOT be on the test. Volume of cylinders and prisms will simply be the area of the base mult. by the height. Pyramids and cones (also unlikely candidates for the test) are 1/3 the volume of their corresponding prism. R-E-L-A-X!!!
ReplyDeleteI'll look through problem sets. Thanks for the advice!
ReplyDeleteFor all of the formulas, go to my NJASK prep page and download the Grade8 reference sheet (pdf).
ReplyDeleteYou are over-stressing!!! You WILL need to know the algberaic "stuff" i.e. Point-slope, quadratic formula, discriminant, etc. The geometry will likely only require circle formulas and prism logic.
PLEASE R-E-L-A-X!! These test results will NOT be viewed by college admission folks!
Can you review a problem like the Problem #2 in Problem Set 6R, Systems of Equations Review? I don't really understand..
ReplyDelete709#5: Algebraic fractions are just fractions, folks. They could have made that one clearer though, the BIGGER fraction bar dictates the grouping.
ReplyDeleteIn #5, the upper bar is bigger, so it implies that [x-4]/[(x+3)/(x-1)].
Instead of dividing you can mult by the reciprocal, yes??????????
Answer choice is D.
Yes!!!!!!!!!!!!!!!!!
ReplyDeleteTomorrow at 7:15... by 7:45 I have to be in the gym... whoever is with me will come with me... no homeroom.
ReplyDeleteLast chat til EOC starts now...
ReplyDeleteSo is it 7 00 7 15 7 30
ReplyDeleteI'm at chat!
ReplyDeleteAnd yes, is it 7:00, 7:15, or 7:30?