User:Zhenghua
An AoPS student that is currently at AIME level. As a somewhat active user on AoPS community and FTW (for-the-win), he basically does only math.
Math Skills
Currently attending AIME level classes or not attending any classes. Before he took AMC 12 Problem Series and is currently taking AIME II as his only math class. His favorite math subject is algebra and he is worst at counting and probability. His geometry skills are also kind of lame.
Profile ID
971407
Problems
1. Larry has a pie shaped like a circle. He cuts the biggest square out of the pie and then leaves the leftovers for the ants. How much pie do the ants get if the pie has a diameter of 10 inches?
![\[A) \ \pi \ \ \ B) \ 10\pi-20 \ \ \ C) \ 20\pi-50 \ \ \ D) \ 25\pi-50 \ \ \ E) \ 50\pi-100\]](http://latex.artofproblemsolving.com/f/7/a/f7addc647c0e44c92a9498d9aef80535fa01fa7a.png)
2. A 16 foot pole is standing at noon. A 4 foot child casts a 2 foot shadow at noon. Assuming that the shadow grows by 2 times each hour, what is the length of the shadow at 3:00pm?
![\[A) \ 8 \ \ \ B) \ 32 \ \ \ C) \ 64 \ \ \ D) \ 128 \ \ \ E) \ 256\]](http://latex.artofproblemsolving.com/1/2/b/12b041edd2a87112efa8d52c6571e2f70c0ec89a.png)
3. What are the sum of the roots of the quadratic, 
?
![\[A) \ -64 \ \ \ B) \ -4 \ \ \ C) \ 2 \ \ \ D) \ 4 \ \ \ E) \ 64\]](http://latex.artofproblemsolving.com/a/8/e/a8ed21563891e9601899e712acef0d11f0784677.png)
4. If $n\equiv2(\text{mod) 5)$ (Error compiling LaTeX. Unknown error_msg) then what is $n^{2010}(\text{mod) 5)$ (Error compiling LaTeX. Unknown error_msg)
![\[A) \ 0 \ \ \ B) \ 1 \ \ \ C) \ 2 \ \ \ D) \ 3 \ \ \ E) \ 4\]](http://latex.artofproblemsolving.com/0/8/2/082232c6baf29739b09f4c6704fb75f886a3d368.png)
5.
