Answer:
39
Step-by-step explanation:
the first three call 3, making it 3*3, then each of them will get 3 more, making it 3+(3*3)+(3*3*3),3+9+27, 39
Find midpoint of segment.
(-1,1), (7,-5)
![x= \frac{-1+7}{2}=3,y= \frac{1+(-5)}{2}=-2](https://tex.z-dn.net/?f=x%3D%20%5Cfrac%7B-1%2B7%7D%7B2%7D%3D3%2Cy%3D%20%5Cfrac%7B1%2B%28-5%29%7D%7B2%7D%3D-2%20%20)
Find slope of line which passes through (-1,1) and (7,-5).
![m= \frac{-5-1}{7-(-1)}= \frac{-6}{8}=- \frac{3}{4}](https://tex.z-dn.net/?f=m%3D%20%5Cfrac%7B-5-1%7D%7B7-%28-1%29%7D%3D%20%5Cfrac%7B-6%7D%7B8%7D%3D-%20%5Cfrac%7B3%7D%7B4%7D%20%20%20)
The slope of perpendicular line is negative reciprocal value of m.
![m_{\perp}=- \frac{1}{m} =- \frac{1}{- \frac{3}{4} } = \frac{4}{3}](https://tex.z-dn.net/?f=m_%7B%5Cperp%7D%3D-%20%5Cfrac%7B1%7D%7Bm%7D%20%3D-%20%5Cfrac%7B1%7D%7B-%20%5Cfrac%7B3%7D%7B4%7D%20%7D%20%3D%20%5Cfrac%7B4%7D%7B3%7D%20)
Write quation of line which slope is
![\frac{4}{3}](https://tex.z-dn.net/?f=%5Cfrac%7B4%7D%7B3%7D)
and passes throug the point (3,-2).
The average of 5, 7, 12, and 12, is (5 + 7 + 12 + 12)/4.
(5 + 7 + 12 + 12)/4 = 36/4 = 9.
The average is 9.