Mrs.smith divided one square mile of land to her 3 children,amy,brianna ,and chad.
1 mile is divided among each children . so the fraction of land each one get is 
Amy's land = 
Brianna's land = 
Chad's land = 
Amy decided to divide her portion of the land equally between her 2 children.
We know Amys land = 1/3
1/3 is divided among two children so we divide the fraction by 2
= 
= 
fraction of mrs. smith's land one of amy's children own.
Chad divided his land equally among his 6 children
We know Amys land = 1/3
1/3 is divided among 6 children so we divide the fraction by 6
= 
= 
fraction of mrs. smith's land one of Chad's children own.
Answer:
i believe the answer is 2.5 ft cubed.
Rotating CD 180 degrees around the point D would mean rotating it to the other side of D, in other words, rotating it clockwise. The new line would be D->M->C
Rotating CD 180 degrees around the point E would mean rotating it clockwise till "E" is a point of the line. The new line would be E->M->D.
Rotating CD 180 degrees would keep the line in the same position right now but with CD being in different order. The new line would be D->M->C.
Best of Luck!
2x+3=-7
-3=-7-3=-10
2x=-10
X=-5