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how can i learn mandarin well?

first: can tell 4 tones in pinyin. second: increse the proper local Chinese words. third: start from building simple sentences.
JL
Answered by Jiaying L. • Mandarin tutor
2453 Views

Explain how fluorescent tubes work

Fluorescent tubes are filled with low pressure mercury, when an electric current is passed through, the electrons in mercury are excited and move to a high energy level, this high level state is unstable and...
MW
Answered by Michael W. • Physics tutor
34663 Views

What four factors influence the rate of reaction?

Temperature, pressure, surface area and concentration all affect the rate of a chemical reaction. Temperature makes the particles more energetic and increases the frequency of collisions Pressure, surface ar...
MW
Answered by Michael W. • Chemistry tutor
8726 Views

Find the coordinates that correspond to the maximum point of the following equation: y = −16x^2 + 160x - 256

To solve this problem, the maximum and minimum points of equations can be deduced through the differentiation process. This looks at the gradient of the function and the maximum/minimum value occurs when the...
MW
Answered by Michael W. • Maths tutor
3593 Views

Find the factors of x^3−7x−6

To find the factors of x 3 -7x-6, a method called equating coefficients can be used. Firstly, set the equation to zero and find a suitable number which satisfies the equation, in this case x=-1 satisfies the...
MW
Answered by Michael W. • Maths tutor
12865 Views