How to say this in English

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• 1. X / 1 * 2 + X / 2 * 3 + X / 3 * 4 +... + X / 99 * 100 = 1 Is the final x = 100 / 99
• 2. Explain an English word oft-predicted
• 3. Is displacement a vector or a scalar?
• 4. Is time a scalar or a vector
• 5. Does time have a direction, a vector or a scalar?
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• 8. Who knows if the rate of change of momentum is a scalar or a vector,
• 9. The difference between the increment of momentum, the change of momentum and the change of momentum is mainly in the aspects of sign and scalar vector Don't ask me anything else. I can't understand it. A classmate asked me to check for him. He said so. I don't understand. I can't check,
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• 12. Question: some students of grade 6 go boating. If 5 people sit on each boat, 14 people have no boat to take. If 7 people sit on each boat, one boat can take 4 people How many students go boating in sixth grade?
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• 15. How to transform rectangular coordinate velocity into polar coordinate velocity In a three-dimensional velocity field, it is necessary to decompose the velocity on a circular surface into radial velocity and tangential velocity We know how to use the dot product of vector to get the radial velocity, but we don't know how to get the tangential velocity. Because velocity has direction, we can't simply use Pythagorean theorem to get the tangential velocity Can you explain in detail how to find the tangent vector of the next derivative
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• 17. Given the vector a = (E, 2), B = (- 3, 5), and the angle between a and B is obtuse, what is the value range of E,
• 18. Given the vector a = (a, 2), B = (- 3, 5), and the angle between vector a and vector B is obtuse angle, the value range of a is obtained Given the vector a = (in, - 2), B = (- 3,5), and the angle between a and B is obtuse, then the value range of in
• 19. Given that vector a = (2, x), vector b = (3, 4), and the angle between vector a and vector B is obtuse, then the value range of X is___ A.x>-2/3 B. X > - 2 / 3 and X ≠ 8 / 3 C. X2 / 3 and X ≠ 8 / 3
• 20. Given that a = (x, 2), B = (- 3, 5), and the angle between a and B is obtuse, then the value range of X is? Letter A. B is vector!