cutiecomittee123
  • cutiecomittee123
Help me with law of sines.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
cutiecomittee123
  • cutiecomittee123
|dw:1450151041694:dw|
anonymous
  • anonymous
bet you can do this one on your own
anonymous
  • anonymous
let me know what you get, i will check it just fill in the answers

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cutiecomittee123
  • cutiecomittee123
Yeah, I am basically doing these so that I can get practice and check my answers with others. Anyways I tried so far and I got 12/sin52=b/sin45 b=12sin52/sin45 b=11.5
anonymous
  • anonymous
ok i see the problem
cutiecomittee123
  • cutiecomittee123
did i do it backwards again?
anonymous
  • anonymous
it is a basic algebra issue how would you solve \[\frac{x}{7}=8\]?
cutiecomittee123
  • cutiecomittee123
multiply both sides by 7
anonymous
  • anonymous
right and how would you solve \[\frac{x}{\sin(45)}=8\]?
cutiecomittee123
  • cutiecomittee123
same concept, multiply both sides by sin(45)
anonymous
  • anonymous
right so you have to solve \[\frac{b}{\sin(45)}=\text{something}\]what do you do? answer multiply by \(\sin(45)\) you always multiply by the denomator
cutiecomittee123
  • cutiecomittee123
this is true
anonymous
  • anonymous
even if that something on the right is a fraction, makes no difference
cutiecomittee123
  • cutiecomittee123
so then just 12/sin(52)((sin(45))
anonymous
  • anonymous
\[\frac{b}{\sin(45)}=\frac{12}{\sin(52)}\]
anonymous
  • anonymous
yes, but of course multiply means multiply in the numerator, not denominator
anonymous
  • anonymous
so \[b=\frac{12}{\sin(52)}\times \sin(45)=\frac{12\times \sin(45)}{\sin(52)}\]
anonymous
  • anonymous
you got that ?
cutiecomittee123
  • cutiecomittee123
hold on, I just has to go do a few chores
cutiecomittee123
  • cutiecomittee123
why would we mulitply the numerator?
anonymous
  • anonymous
what is \[5\times \frac{4}{3}\]?
cutiecomittee123
  • cutiecomittee123
25/3? yikes I am not the best with fractions
cutiecomittee123
  • cutiecomittee123
20/3 I mean
anonymous
  • anonymous
yes what did you do? answer: you multiplied the numerator by 5
cutiecomittee123
  • cutiecomittee123
ohh gotcha.
cutiecomittee123
  • cutiecomittee123
so its 12(sin(42)/sin(52)
anonymous
  • anonymous
yes
cutiecomittee123
  • cutiecomittee123
b=10.19
anonymous
  • anonymous
you want me to check?
cutiecomittee123
  • cutiecomittee123
yes please
cutiecomittee123
  • cutiecomittee123
alrighty
anonymous
  • anonymous
i think i got a slightly different answer hold on
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=12sin%2845%29%2Fsin%2852%29
anonymous
  • anonymous
i got about \(10.77\)
cutiecomittee123
  • cutiecomittee123
oh well I may have roudned weird becuase it came out to be 10.18966 so I rounded to 10.19
cutiecomittee123
  • cutiecomittee123
hmm let me try again
anonymous
  • anonymous
ok
anonymous
  • anonymous
i just use wolfram as you can see above easier than a calculator
cutiecomittee123
  • cutiecomittee123
Yep I got that same answer. I forgot to put the numerator and denominator in parenthesis when entering it in to my calculator
anonymous
  • anonymous
ok now you know how to do this with no agony right? set up the ratio, multiply by the denominator
cutiecomittee123
  • cutiecomittee123
Yeah I think I can do the rest on my own, if not Ill try another thread AGAIN lol
cutiecomittee123
  • cutiecomittee123
Do you actually want to help me with one more, this time its a word problem and I basically just need help with placement. @satellite73

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