Question

@iGreen.

Find y to the nearest tenth.

Answer 1

https://alphaomegaca.ignitiaschools.com/media/g_geo_2013/5/04.gif

Answer 2

Use cosine, which is \(\sf \dfrac{Adjacent}{Hypotenuse}\)

\(\sf cos(20^o) = \dfrac{y}{8}\)

Can you solve that?

Answer 3

no i dont think i can

Answer 4

Okay, first we find the cosine of 20 degrees, plug it in your calculator.

\(\sf cos(20^o) = 0.939692621\)

Plug it back in:

\(\sf 0.939692621 = \dfrac{y}{8}\)

Can you solve that now?

Answer 5

so after i do cos(20) what do i do?

Answer 6

Now you solve for 'y'..

\(\sf 0.939692621 = \dfrac{y}{8}\)

Answer 7

so you would divide right?

Answer 8

No..8 is being divided by 'y'..to get rid of the 8 we have to do the opposite of division..

Answer 9

so multiply

Answer 10

Yep.

Answer 11

And what do you get?

Answer 12

3.26465649451

Answer 13

How did you get that?

Answer 14

You have to multiply \(\sf 0.939692621 \times 8\)..

Answer 15

thats what i did

Answer 16

7.517540968

Answer 17

i had the wrong number

Answer 18

Do it again, because I don't think 3.26465649451 is correct..

Answer 19

7.517540968

Answer 20

Yep, so your answer is approximately 7.5.

Answer 21

got it thanks

Answer 22

No problem.