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# Tutor profile: Jiafeng L.

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Jiafeng L.
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## Questions

### Subject:Mandarin

TutorMe
Question:

write the Pinyin for the sentence below: 世界你好！ (Hello world!)

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Jiafeng L.

shi jie ni hao!

### Subject:Linear Algebra

TutorMe
Question:

Use Gauss-Jordan elimination to solve the system: x - 2y + 3z = 9 -x + 3y = -4 2x - 5y +5z =17

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Jiafeng L.

First use Gaussian elimination to obtain the row-echelon form: [1 -2 3 9; 0 1 3 5; 0 0 1 2] then apply elementary row operations: R1+2R2 -> R1: [1 0 9 19; 0 1 3 5; 0 0 1 2] R2-3R2 -> R2 [1 0 9 19; 0 1 0 -1; 0 0 1 2] R1-R3 -> R1: [1 0 0 1; 0 1 0 -1; 0 0 1 2] so finally x = 1, y = -1, z = 2.

### Subject:Statistics

TutorMe
Question:

There is an unbalanced coin. If you flip it you could get the probability of head P(head) = 0.6 and tail P(tail) = 0.4. Then how can we use it to predict an event that would happen with a probability of 0.5?

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Jiafeng L.

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