cutiecomittee123
  • cutiecomittee123
Precalc help!!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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cutiecomittee123
  • cutiecomittee123
|dw:1441932558113:dw|
cutiecomittee123
  • cutiecomittee123
find x
anonymous
  • anonymous
You have 2 angles. You know that the sum of the angles of a triangle are =180 so what is the measure of the unknown angle Z

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cutiecomittee123
  • cutiecomittee123
z=38
anonymous
  • anonymous
Have you started using sin/cos yet?
cutiecomittee123
  • cutiecomittee123
yeah i have
anonymous
  • anonymous
Okay So for this we're going to use 50degrees, x and 35
cutiecomittee123
  • cutiecomittee123
wait 50 degrees? you mean 48?
anonymous
  • anonymous
x is opposite 52 degrees and 35 is adjacent 52 degrees, got that much?
anonymous
  • anonymous
52*
cutiecomittee123
  • cutiecomittee123
oh okay yes
anonymous
  • anonymous
So which trig function deals with opposite and adjacent?
cutiecomittee123
  • cutiecomittee123
so tan(52)=x/35
anonymous
  • anonymous
yes And to get x by itself what do you have to do?
cutiecomittee123
  • cutiecomittee123
multiply each side by 35 and so 35tan(52)=x
anonymous
  • anonymous
Yes.
cutiecomittee123
  • cutiecomittee123
x=44.80
anonymous
  • anonymous
Are you expected to have a numerical answer, and if so do you have access to a graphing calculator to solve that?
cutiecomittee123
  • cutiecomittee123
it says round to the nearest two decimal places
anonymous
  • anonymous
Yes, thats right
cutiecomittee123
  • cutiecomittee123
and on my calculator i get 44.79795713 so i rounded it to 44.80 is that right?
anonymous
  • anonymous
Yep.
cutiecomittee123
  • cutiecomittee123
sweet thanks
anonymous
  • anonymous
Not a problem, if you have any more, tag me.
cutiecomittee123
  • cutiecomittee123
can you helo with another one?
anonymous
  • anonymous
yeah
cutiecomittee123
  • cutiecomittee123
i do @Audeezy
cutiecomittee123
  • cutiecomittee123
|dw:1441933111757:dw|
cutiecomittee123
  • cutiecomittee123
this time solve for z. cant i just add together the given angles sp 90+47 and then subtract that from 180?
cutiecomittee123
  • cutiecomittee123
so then z=43 degrees
anonymous
  • anonymous
Yes because you know the triangle is =180 and the 90deg angle is given aswell as 47
anonymous
  • anonymous
Yes, 180-90-47=43 :)
cutiecomittee123
  • cutiecomittee123
alright, so do you know what angle an angle of elevation is?
cutiecomittee123
  • cutiecomittee123
|dw:1441933304998:dw|
cutiecomittee123
  • cutiecomittee123
a or b
anonymous
  • anonymous
are you given any values?
cutiecomittee123
  • cutiecomittee123
Well the question is: A lamp casts a shadow of a man standing ten feet away from the lamp post the shadow is 7 feet long the angle of elevation from the tip of the shadow of the lamp is 50 degrees. To the nearest foot the lampost is how tall?
anonymous
  • anonymous
Let me try to draw and tell me if I properly represented i t
cutiecomittee123
  • cutiecomittee123
my problem is i dont know what an angle of elevation is
anonymous
  • anonymous
|dw:1441933555550:dw|
anonymous
  • anonymous
tan(50)=man/7 man=7tan(50) and man= how tall he is .
anonymous
  • anonymous
Throw that in a calculator and see if it matches with an answer
cutiecomittee123
  • cutiecomittee123
wait so it would be tan(50)=x/7 multiply both sides by 7 and then 7tan(50)=x right?
anonymous
  • anonymous
Think so, I belive that makes him 8.3~ feet tall
cutiecomittee123
  • cutiecomittee123
wow so x=8.34 feet that a tall man!
anonymous
  • anonymous
Is it open answer?
cutiecomittee123
  • cutiecomittee123
what?
anonymous
  • anonymous
Are you doing problems out of a textbook?
cutiecomittee123
  • cutiecomittee123
oh we are finding the height of the lamp post! much better lol. I am doing a test but it is open notes and I had things similar on my notes but i always like to check and make sure i am doing it right ya know?
anonymous
  • anonymous
yeah
anonymous
  • anonymous
Dont put down an answer yet, let me run through my math one more time
anonymous
  • anonymous
@cutiecomittee123 still with me?
anonymous
  • anonymous
|dw:1441934203450:dw|
cutiecomittee123
  • cutiecomittee123
wow yeah, darn it i already answered this sucks, luckily i can redo it though
anonymous
  • anonymous
Can you change your answer, ior retake it as a whole
cutiecomittee123
  • cutiecomittee123
but that would make more sense because ou have to keep in mind the shadow of the man also adds into the horizontal length
cutiecomittee123
  • cutiecomittee123
i have to retake the whle thing sadly
anonymous
  • anonymous
ahh, sorry about that

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