You distribute the negative in the second equation
Answer:
It goes right
Step-by-step explanation:
Your probably thinking I'm wrong cuz -8 on the x axis goes left instead of right but trust me my Algebra teacher taught me this, and I dunno why
Answer:
<h2>a = 16</h2>
Step-by-step explanation:
Look at the picture.
The formula of an area of a trapezoid is:
![A=\dfrac{b_1+b_2}{2}\cdot h](https://tex.z-dn.net/?f=A%3D%5Cdfrac%7Bb_1%2Bb_2%7D%7B2%7D%5Ccdot%20h)
- bases
- height
We have:
![A=128,\ b_1=a+2,\ b_2=a-2,\ h=8](https://tex.z-dn.net/?f=A%3D128%2C%5C%20b_1%3Da%2B2%2C%5C%20b_2%3Da-2%2C%5C%20h%3D8)
Substitute:
![128=\dfrac{a+2+a-2}{2}\cdot8\\\\128=\dfrac{2a}{2}\cdot8](https://tex.z-dn.net/?f=128%3D%5Cdfrac%7Ba%2B2%2Ba-2%7D%7B2%7D%5Ccdot8%5C%5C%5C%5C128%3D%5Cdfrac%7B2a%7D%7B2%7D%5Ccdot8)
<em>divide both sides by 8</em>
![16=a\to a=16](https://tex.z-dn.net/?f=16%3Da%5Cto%20a%3D16)
Cot x=1/tan x
so 0.78=1/tanx
tanx=1/0.78≈1.2820512820512820512820512820513
Answer:
B
Step-by-step explanation: