Answer:
![a = \frac{w + 4 - 3b}{6}](https://tex.z-dn.net/?f=a%20%3D%20%20%5Cfrac%7Bw%20%2B%204%20-%203b%7D%7B6%7D%20)
Step-by-step explanation:
![w = 3(2a + b) - 4 \\ w + 4 = 6a + 3b \\ w + 4 - 3b = 6a \\ \frac{w + 4 - 3b}{6} = \frac{6a}{6} \\ a = \frac{w + 4 - 3b}{6}](https://tex.z-dn.net/?f=w%20%3D%203%282a%20%2B%20b%29%20-%204%20%5C%5C%20w%20%20%2B%204%20%3D%206a%20%2B%203b%20%5C%5C%20w%20%2B%204%20-%203b%20%3D%206a%20%5C%5C%20%20%5Cfrac%7Bw%20%2B%204%20-%203b%7D%7B6%7D%20%20%3D%20%20%5Cfrac%7B6a%7D%7B6%7D%20%20%5C%5C%20a%20%3D%20%20%5Cfrac%7Bw%20%2B%204%20-%203b%7D%7B6%7D%20)
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A. c <= -4 so is the top graph;
b. c > 4 so is the second graph;
c. c < 10 so will be a graph with an open circle starting at 10 and going left towards negative infinity
Answer: B. Triangle
Step-by-step explanation:
The vertical cross-section of a pyramid is a triangle, and the horizontal cross-section of a pyramid is a square.
30-2 = 4x
28 = 4x
Divide both sides by 4 to eliminate the 4.
x=7
Area of a circle = πr²
Radius = 18/2 = 9
A = (3.14)(9)²
A = 254.34
Hope this helps :)