Question

help me please

Answer 1

you can use either
\[\sin(x)=\sqrt{1-(\frac{3}{4})^2}\] or draws a triangle

Answer 2

there is a picture of an angle whose cosine is \(\frac{3}{4}\)
to find the sine, you need \(b\) which you find via pythagoras as
\[b^2+3^2=4^2\\
b^2+9=16\\
b^2=7\\
b=\sqrt7\]

Answer 3

that makes
\[\sin(x)=\frac {\sqrt7}{4}\]
but there is a problem here

Answer 4

what do i do

Answer 5

whoever wrote this question does not understand trig
just because you know the cosine, doesn't mean you know the sine
it could be
\[\frac{\sqrt7}{4}\] but it could also be
\[-\frac{\sqrt7}{4}\]
also it should be written as \(\cos(x)\) not cosx
not a very convincing display of math education

Answer 6

to get the decimal, use a calculator

Answer 7

http://www.wolframalpha.com/input/?i=sqrt%287%29%2F4

i get about \(.66\)
really a very poorly written question
where does it come from?

Answer 8

my school

Answer 9

sorry about your school