I'm stuck and I need to finish these problems ASAP. Someone pleaaaase help me? .

Question

I'm stuck and I need to finish these problems ASAP. Someone pleaaaase help me? >.<

1. If tan θ = 5 / 4, calculate the value of cos θ.

2. If cos θ = 2√10 / 7, calculate the value of sin θ.

3. If sin θ = 1/√2, calculate the value of θ.

anonymous · Answer

Kristine what grade are you in?

anonymous · Answer

Junior, why?

anonymous · Answer

I'ma freshman. I don't know this :'(

aum · Answer

|dw:1410307217931:dw|

anonymous · Answer

aww, well thanks for trying I guess.

anonymous · Answer

Sorry:'(

aum · Answer

tan(theta) = opposite / adjacent = 5/4

Find the hypotenuse of the right triangle  and then cos(theta) = adjacent / hypotenuse = 4 / hypotenuse

anonymous · Answer

gahhh, I'm totally gonna fail this assignment. I have no idea what you just said @aum... I have to submit it in 2 minutes anyways so there's no use.

aum · Answer

Are you taking a test?

anonymous · Answer

No. Just an online assignment that only gives you a certain amount of time to finish it.

anonymous · Answer

I messaged you.

anonymous · Answer

kristine