Melody

Thanks Chris, I had to think about it a little bit too :)

Hi asinus,

Your answer does not make sense.

x is not an angle it is a ratio. so you cannot have sin(x)

Certainly if the angles are both 45 degrees this will work

 but one angle might be 30 degrees and the other 60degrees

or  as I have said, one is x degrees and the other is 90-x degrees.

Think of this triangle and it might help you understand.  :)

ok, you got a gradient of about -16.  It is definitely negative anyway because it slopes to the top left corner, so which anwer/s do younow know are definitely wrong?

Which answers are now still possibly correct?

What might the y intercept be approximately?  Which answers does this rue out? 

What answers are left now?

HINT:

remember that the equation of a line is y=mx+b

where m is the gradient and b is the y intercept   

sin(arcsin x + arccos x)

\(sin(arcsin x + arccos x)\\ let\;\;asin(x)=\theta\\ then\;\;acos(x)=90-\theta\\ so\\ sin(arcsin x + arccos x)=sin(\theta+90-\theta)=sin(90)=1\)

I don't intend to give you just the answer.  I am not here to do your homework but I am happy to help you learn.

*Is the gradient of this line  positive or negative.  Which choices are ruled out?

*What is the approximate y intercept?  Which choices are ruled out?

Which choices are left?

Now by visual inspection, which is the best choice :)

If you want to interact with me I will help you work through it :)

Hi Sedadejo :)

I cannot speak Spanish but I do know how to use 'Google Translate'  :)
What is your mathematics question?

No puedo hablar español pero sí sé cómo usar 'Google Translate' :)
¿Cuál es su pregunta de matemáticas?

Hi asinus,

It is not false  

I DO WISH PEOPLE WOULD USE BRACKETS PROPERLY!!!

e^4ln(2) =  \(e^4ln(2)=ln2*e^4 \approx 37.8\)

Hi Carlson :)

how do i work this equation into a parabola/straight line? y=x+2 ; f(x)=x^2

Huh?

The first on IS a straight line  AND the second one IS a parabola.

What is 81\(blank/4)=9? I can't figure out blank!

I assume that you mean

 81/(blank/4)=9?

\(81 \div \frac{x}{4}=9\\ 81 \div \frac{x}{4}\times \frac{x}{4}=9\times \frac{x}{4}\\ 81= \frac{x}{4}\times 9\\ 81= \frac{9x}{4}\\ 81\times \frac{4}{9}= \frac{9x}{4}\times \frac{4}{9}\\ 9\times4= x\\ x=36 \)

OR

I could have just said

81/9=9

so

blank/4=9

so

36/4 = 9 so the number must be 36