Precalc help!!

- cutiecomittee123

Precalc help!!

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- cutiecomittee123

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- cutiecomittee123

find x

- 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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## More answers

- cutiecomittee123

z=38

- anonymous

Have you started using sin/cos yet?

- cutiecomittee123

yeah i have

- anonymous

Okay
So for this we're going to use 50degrees, x and 35

- cutiecomittee123

wait 50 degrees? you mean 48?

- anonymous

x is opposite 52 degrees and 35 is adjacent 52 degrees, got that much?

- anonymous

52*

- cutiecomittee123

oh okay yes

- anonymous

So which trig function deals with opposite and adjacent?

- cutiecomittee123

so tan(52)=x/35

- anonymous

yes
And to get x by itself what do you have to do?

- cutiecomittee123

multiply each side by 35 and
so 35tan(52)=x

- anonymous

Yes.

- cutiecomittee123

x=44.80

- anonymous

Are you expected to have a numerical answer, and if so do you have access to a graphing calculator to solve that?

- cutiecomittee123

it says round to the nearest two decimal places

- anonymous

Yes, thats right

- cutiecomittee123

and on my calculator i get 44.79795713 so i rounded it to 44.80 is that right?

- anonymous

Yep.

- cutiecomittee123

sweet thanks

- anonymous

Not a problem, if you have any more, tag me.

- cutiecomittee123

can you helo with another one?

- anonymous

yeah

- cutiecomittee123

i do @Audeezy

- cutiecomittee123

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- cutiecomittee123

this time solve for z. cant i just add together the given angles sp 90+47 and then subtract that from 180?

- cutiecomittee123

so then z=43 degrees

- anonymous

Yes because you know the triangle is =180 and the 90deg angle is given aswell as 47

- anonymous

Yes, 180-90-47=43 :)

- cutiecomittee123

alright, so do you know what angle an angle of elevation is?

- cutiecomittee123

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- cutiecomittee123

a or b

- anonymous

are you given any values?

- 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

Let me try to draw and tell me if I properly represented i t

- cutiecomittee123

my problem is i dont know what an angle of elevation is

- anonymous

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- anonymous

tan(50)=man/7 man=7tan(50) and man= how tall he is .

- anonymous

Throw that in a calculator and see if it matches with an answer

- cutiecomittee123

wait so it would be tan(50)=x/7
multiply both sides by 7 and then
7tan(50)=x right?

- anonymous

Think so, I belive that makes him 8.3~ feet tall

- cutiecomittee123

wow so x=8.34 feet that a tall man!

- anonymous

Is it open answer?

- cutiecomittee123

what?

- anonymous

Are you doing problems out of a textbook?

- 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

yeah

- anonymous

Dont put down an answer yet, let me run through my math one more time

- anonymous

@cutiecomittee123 still with me?

- anonymous

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- cutiecomittee123

wow yeah, darn it i already answered this sucks, luckily i can redo it though

- anonymous

Can you change your answer, ior retake it as a whole

- 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

i have to retake the whle thing sadly

- anonymous

ahh, sorry about that

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