This Blog exists for the collective benefit of all algebra students. While the posts are specific to Mr. Chamberlain's class, any and all "algebra-ticians" are welcome. The more specific your question (including your own attempts to answer it) the better.
Well, if the back of your hand is is 0.12x10^2 in^2, how many square inches is that (I'll admit that was a strange way to write it, but you should be able to figure it out).
Once you have the square inches, how will you calculate the number of pores? It's JUST multiplication, right? Then you want to make sure your answer is formatted properly in SciNot, yes?
For #63 on pg 466, would the equation be A=200(1+(.15/2)^3?
I'm kinda confused on how it is in hours. Would the equation be the same if it were in years? Such as 15% in 1/2 a year would be same as 15% in 1/2 an hour?
Yup... it's really all just multiplication. I converted the back of the hand to square inches to get started, but that was actually an unnecessary step... nobody asked me how many square inches made up the back of the hand.
For #63, be careful, you compound interest, not people!
The crowd is growing by 15% every 1/2 hour, so if one half hour is your PERIOD OF TIME, what power will you have to raise 200*(.15)^? to show 3 hours worth of growth?
Yup, the 1/2 hour was put there to confuse you... however the 1/2 hour represents a WHOLE PERIOD of time... in this case there is no compounding within the whole period, as you would have with a bank account.
One thing I'm confused about is APR & APY. I can't find any explanations in the book.. Will we have to know how to compute them? I don't even know what they are!
APR & APY are Annual Percentage Rate & Annual Percentage Yield, but what do they mean?
APR and APY will NOT be on the test... that was just an extra "pearl of wisdom" from Mr. C.
APY refers to the what the interest rate would have to be to earn the same interest as a compounded rate.
Stated another way, if you earn interest at an annual percentage rate (APR) of 5% compounded daily, you know you will end up earning more than 5% in interest by the end of the year, right?
So, the annual percentage yield (APY) represents the percentage of interest that you actually earned... ca-peesh?
Also, I was looking at the Unit 7 Extra Practice I found on Math Chamber, and I don't understand how to do #46 "5 years ago". Would you just divide by 2, 5 times?
I don't understand hwo #20 is guess and check. They are asking you to estimate simply because they are telling you that the calculation is an estimate. #20 is quite straightforward... no g&c to do, yes?
Ack I had so much L.A. homework! But here come my questions =)
ReplyDeleteWhat is it?
ReplyDeleteOn #39 on pg 465, I don't know how to start!
ReplyDeleteIs making a table of values the only way to graph an exponential function?
ReplyDeleteDear #39,
ReplyDeleteWell, if the back of your hand is is 0.12x10^2 in^2, how many square inches is that (I'll admit that was a strange way to write it, but you should be able to figure it out).
Once you have the square inches, how will you calculate the number of pores? It's JUST multiplication, right? Then you want to make sure your answer is formatted properly in SciNot, yes?
For #63 on pg 466, would the equation be
ReplyDeleteA=200(1+(.15/2)^3?
I'm kinda confused on how it is in hours. Would the equation be the same if it were in years? Such as 15% in 1/2 a year would be same as 15% in 1/2 an hour?
Oh, do you just multiply the two notations together? For #39?
ReplyDeleteFor #39.. Would the answer be 7.8*10^3?
ReplyDeleteDear #39,
ReplyDeleteYup... it's really all just multiplication. I converted the back of the hand to square inches to get started, but that was actually an unnecessary step... nobody asked me how many square inches made up the back of the hand.
I got 248 people for #63.. But the book says its wrong..
ReplyDeleteFor #39, haha, okay! =)
ReplyDeleteFor #63, be careful, you compound interest, not people!
ReplyDeleteThe crowd is growing by 15% every 1/2 hour, so if one half hour is your PERIOD OF TIME, what power will you have to raise 200*(.15)^? to show 3 hours worth of growth?
To.. Umm.. 6?
ReplyDeleteYou would multiply the times compounded per hour times the time in hours?
Oh now I understand.. I put the 1/2 in the wrong place.. I put it in the spot of "Times compounded".
Yup, the 1/2 hour was put there to confuse you... however the 1/2 hour represents a WHOLE PERIOD of time... in this case there is no compounding within the whole period, as you would have with a bank account.
ReplyDeleteMmmhmm! So the equation would be A=200(1+.15)^6
ReplyDelete??
One thing I'm confused about is APR & APY.
ReplyDeleteI can't find any explanations in the book..
Will we have to know how to compute them?
I don't even know what they are!
APR & APY are Annual Percentage Rate & Annual Percentage Yield, but what do they mean?
APR and APY will NOT be on the test... that was just an extra "pearl of wisdom" from Mr. C.
ReplyDeleteAPY refers to the what the interest rate would have to be to earn the same interest as a compounded rate.
Stated another way, if you earn interest at an annual percentage rate (APR) of 5% compounded daily, you know you will end up earning more than 5% in interest by the end of the year, right?
So, the annual percentage yield (APY) represents the percentage of interest that you actually earned... ca-peesh?
Ok! I'm glad =)
ReplyDeleteOooh I gotsk!
I'm still having trouble with those "Guess & check" problems. Could you explain #20 on the Chapter Test?
ReplyDeleteAlso, I was looking at the Unit 7 Extra Practice I found on Math Chamber, and I don't understand how to do #46 "5 years ago". Would you just divide by 2, 5 times?
ReplyDeleteYes on #63 btw.
ReplyDeleteI don't understand hwo #20 is guess and check. They are asking you to estimate simply because they are telling you that the calculation is an estimate. #20 is quite straightforward... no g&c to do, yes?
Okay!
ReplyDeleteOh sorry about that, I didn't read the whole question. =)
Will there be questions on the test that you do have to work through guess & check on?
Could a possible answer for #22 be
ReplyDelete3*4^-2
and
3*(1/16)^1
?
You are overthinking #46... a 5thgrader would answer that without thinking.
ReplyDeleteWhatever the investment was worth 5 years ago, it's value today represents a doubling, so all you need to do is divide by 2 ONCE, right?
As for 10 years from now, it will simply double TWICE right?
Ohh... I got #46.. I'm too tired.. I have got to stop reading all of these questions & missing words!!
ReplyDeletefor #22, yup!
ReplyDeleteI gotta go... you are prepared... SLEEP WELL!
I feel confident! =)
ReplyDeleteGood night!