Monday, May 14, 2007

Similarity Test tomorrow!!!!!

We will be going over 13.4, 13.5 and 14.3 on Wednesday!

14.3
  • (2-32) all

posted by msichan @ 10:19 AM

3 Comments:

At Monday, May 14, 2007 at 4:37:00 PM EST, Blogger Keenan said...

Hey All... I know no one uses this thing anymore but I need some help. #4 13.4... I get the equation that you put it in. 42squared= 36squared+ 34squared- 2(36)(34)* Cos A... I just cant solve it using Algebra.... Can anyone out ther help me

 
At Monday, May 14, 2007 at 7:25:00 PM EST, Anonymous Anonymous said...

hey. is mary out there??? ANYWHERE?!!?!?!?

 
At Monday, May 14, 2007 at 9:26:00 PM EST, Blogger M.Velasco said...

*stares at clock* ...*sniff* ;__;

Hoh'snap, crackle, pop. It's 10:10. Oh my friggers. Billie, Sillie, I'm so sorry I missed your phone calls. Are you both still awake? I'm sorry. I went to take a nap, but I was so tired and ended up waking up about an hour or so ago and I just finished the last load of laundry I was supposed to do this afternoon.

I'm so far behind. >.<;; Ooh, dang it. *snaps* Did you both just call to tell me we were meeting tomorrow at the library? Or were we going to go over something? Bwaah. I'm sorry, I don't think I can help you Billie and Sillie, since I'm just going to start my homework. *sigh*

Call me via cell phone tomorrow morning if you still want to go over something...? I'll see you guys later.

- - - - - - - - - -

Hey, Keenan. ^-^

I'm sorry for such a late reply, but if you still need some help:

Okie dokies. Like you've said, the equation is--

42^2 = 34^2 + 36^2 -2(34)(36)Cos A.

Your next line would be:

42^2 - 34^2 - 36^2 = -2(34)(36) Cos A.

Now what would you do to isolate Cos A?

Cos A= 42^2 - 34^2 - 36^2 / -2(34)(36).

[[Cos A equals 42-squared minus 34-squared minus 36-squared all over -2(34)(36)]]

-Punch in the numerator into the calculator:

42^2 - 34^2 - 36^2 [[You should get -688.]]

-Press divide and don't forget to put -2(34)(36) in parenthesis, then hit equal. [[You should get -2448 and then 0.28104...after you hit the equal button.]]

-Since this is the inverse, hit 2nd [[or shift? XD]] then the Cosine button. You should get 73.677...and so on.

Well, that was my answer. I'm so sorry if I made a mistake, Keenan. >.<;; If you get a different answer, just tell me. XD

Goodnight everybody, and much luck for the test. ^-^

Sincerely,
--Mary.

 

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