Please help me. I need help
2 answers:
Look at the first picture.
In Quadrant II tangent is negative and cosine is negative too.
We have:

therefore we have the point (-3, 2) → x = -3 and y = 2.
Calculate r:

Calculate cosine:

Your answer is 
<h3>
Answer:</h3>
a. -(3√13)/13
<h3>
Step-by-step explanation:</h3>
The cosine can be found from the tangent by way of the secant.
tan(θ)² +1 = sec(θ)² = 1/cos(θ)²
Then ...
cos(θ) = ±1/√(tan(θ)² +1)
The <em>cosine is negative in the second quadrant</em>, so we will choose that sign.
cos(θ) = -1/√((-2/3)² +1) = -1/√(4/9 +1) = -1/√(13/9)
cos(θ) = -3/√13 = -(3√13)/13 . . . . . matches your selection A
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Answer: 1. Proportional 2. Not Proportional
Step-by-step explanation: cross multiply.
1. 16*9=144
36*4=144
2. 8*80= 640
20*20=400
So this says
n*(-5/8)=-0.4
n(5/8)=0.4
n=0.4x8/5
n=16/25
I thinl its b if not srry
A^2 - b^2 = (a - b)(a + b)
169x^2 - 64 = (13x - 8)(13x + 8)
Answer: 125:700
Step-by-step explanation:
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