Question

Find y if the point (15, y) is on the terminal side of θ and\[\cos\theta=\frac{15}{17}\](Enter your answers as a comma-separated list.)

My result was \[\pm8\]but I'm told that it's the wrong answer. ッ

Answer 1

Can you post your work?

Answer 2

\[y=\sqrt{17^{2}-15^{2}}=\sqrt{289-225}=\sqrt{64}=\pm8\]

Answer 3

Okay, does that help or should I do anything else?

Answer 4

Did you do anything else?

Answer 5

\[x=15,y=8,r=17\]\[\sin\theta=\frac{8}{17},\cos\theta=\frac{15}{17},\csc\theta=\frac{17}{8},\sec\theta=\frac{17}{15}\]I would have kept going but I'm not sure if I'm going in the right direction.

Answer 6

Yes you are in the right direction that is what I got.

Answer 7

It is the wrong answer apparently...

Answer 8

Did you submit it?

Answer 9

That is odd

Answer 10

I put \[\pm8\]Wrong answer, it says.

Answer 11

Wait did you have to type your answer?

Answer 12

Yes. (I put -8, 8)

Answer 13

Does it automatically correct it?

Answer 14

@jim_thompson5910 @ganeshie8 @Hero

No, it does not.

Answer 15

@DanJS @dan815

Answer 16

Ok so your teacher said it was wrong

Answer 17

No, the website says I am wrong.

Answer 18

http://prntscr.com/8di0sp

Answer 19

Ok that is a auto correcting website?

Answer 20

So maybe you put an extra space or something?

Answer 21

...No?

Answer 22

Ok sorry I can't help further

Answer 23

...Okay thanks anyway....

Answer 24

@DanJS can you help? :c

Answer 25

...I'm just going to repost this.