October 22, 2008

Using Equations (CA SS: 5.0)

Remember to identify/label your unknowns!!!

4) There are 12 more history books than science books.

s = number of science books
s + 12 = number of history books

13) the sum of an even integer, 1/2 of the next even integer, and 1/4 of the following even integer.

n = even integer
n + 2 = next even integer
n + 4 = following even integer

n + 1/2 (n+2) + 1/4 (n + 4)

p.160 (4-40:multiples of 4)

Summaries: None

25 comments:

ZornRockman said...

Mr. Gerson do we solve for all of them since the directions tell us to just write an expression

Anonymous said...

can someone please help me w/# 16.. I already have the unknowns but i dont know what to do after i have that solved.

Erica M.

Period 2

Anonymous said...

Number 12, is the number we start out with an odd or even, because i can't answer the question with out know that. Unless we're suppose to write both answers down.

-Zoya A.

Mr. Gerson said...

#12 does not talk about odds or evens.

Mr. Gerson said...

Try underlining and circling in #16. If you have the unknown labeled, then it is easy to show a sum.

Mr. Gerson said...

Chris, you can only solve EQUATIONS. EXPRESSIONS can only be evaluated or simplified.

Anonymous said...

thx that helped.

Erica M

Period 2

*dreamstar* said...

Mr. Gerson I've finally been getting high scores on the study island games, but when I look at the high score tables, it says that the scores for our school are currently unavaliable, so I can't see my score. I've also gotten higher scores than the state wide people but it won't put me up there!!! I don't know what to do.

Shiloh S. Per. 3

Anonymous said...

Ooops! Sorry, i was looking at the wrong equation. Never mind.
-Zoya A.

Anonymous said...

can someone help me with #28, i dont understand where to start, and then from there where to go.

mmicaela tom
period 1

Anonymous said...

How come there are no summaries today?
Does that mean that we don't write a summary for today's lesson?

I have the answer to number 16 but I don't know how to show how I got it.

Dahnby J.
Per. 2

Anonymous said...

The same thing happened to me in the slingshot game, it wouldn't put me on the high score table but I know I was making high enough scores.

Lauren C.
Period 2

Anonymous said...

Dahnby,

n=a number
1/3=1/3 of a number

1/3n+n=48
1 1/3n =48
4/3n =48
3/4 (4/3n)=3/4 (48)
1n =36
n =36

kylie a.
per. 3

Anonymous said...

hi Mr.Gerson.
:]

the homework was easy exept for the problem about
I=PRT.
can you please go over it in class tommorrow.
thank<33

~NATALIE W.
PER.1

Anonymous said...

mr gerson
i dont understand problem number 36.
please go over it in class.
thank you

morgan c
period 4

Anonymous said...

I still don't understand why 1/3n+n=48 becomes 1 1/3n=48...
Wouldn't n+n=2n?

Is there a property to justify this step?
Maybe then I can understand it better...

Dahnby J.
Per. 2

Anonymous said...

Can someone please explain how to do number 28. I looked back at my notes but i still don't understand how to do it.

Zoya A.

Mr. Gerson said...

Shiloh, send a message to the people at StudyIsland and see what they say.

Mr. Gerson said...

Dahnby, n + 1/3 n is NOT equal to n + n. n + 1/3 n = 3/3 n + 1/3 n. 3/3 + 1/3 = 4/3. 4/3 is NOT equal to 2.

Anonymous said...

Oh~!
Thank you Mr. Gerson!!!
Wow, I'm going mental from the stress... Oh well. XD

Anonymous said...

i don't get how you do #36, how do you get the length and width!
Can somebody help me please!


Linda L.
Per.2

Anonymous said...

The NASA pic of Enchanting Saturn is beautiful.

kylie a.
per. 3

Unknown said...

I don't understand how to write an equation for # 24. can someone help me??!

Brett S.
per.4

Anonymous said...

Linda,


length-L
width-3/4L
Perimeter = 50
length-L+2
width-3/4L+2

2[(L+2)+(3/4L+2)] = 50

Regular

2(L+3/4L)=42
2L+3/2L =42
7/2L =42
2/7 (7/2L)=2/7(42)
1L =12
L=12

Length-12cm
Width-9cm

kylie a.
per. 3

Anonymous said...

Linda,


length-L
width-3/4L
Perimeter = 50
length-L+2
width-3/4L+2

2[(L+2)+(3/4L+2)] = 50

Regular

2(L+3/4L)=42
2L+3/2L =42
7/2L =42
2/7 (7/2L)=2/7(42)
1L =12
L=12

Length-12cm
Width-9cm

kylie a.
per. 3