(x^2-4x+4)-(9y^2+18y+9)=9 (x-2)^2-(3y+3)^2=9

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I am a Ph.D student in Electrical and Computer Engineering at Colorado State University (CSU) currently. Before coming to CSU, I got my bachelor's degree at a famous university in China that specially cultivates middle school and high school teachers. My major was mathematics, and I got a teacher's certificate in China. I tutored several undergraduates from CSU last year. I can teach all of the math covered in middle school and high school as well as linear algebra, calculus, and probability at undergraduate and graduate levels. I am passionate about showing people easy ways to succeed in math!

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ACT Math, Algebra 1, Algebra 2, Calculus, Discrete Math, Geometry, Prealgebra, Precalculus, Probability, SAT Math, Statistics, Trigonometry
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IELTS, Public Speaking, TOEFL
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MATLAB
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IELTS, TOEFL
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Elementary (K-6th)
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ACT Math, GRE, IELTS, SAT Math, TOEFL
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Public Speaking, Statistics
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I have used Matlab for research for 5 years.

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(x^2-4x+4)-(9y^2+18y+9)=9 (x-2)^2-(3y+3)^2=9

d r t help? (answer)

The length of the trip is 45km/h*6h=270km, so the average speed of the trip is 270km/5h=54km/h.

Find the sum (answer)

{3n+5} and {2n} are both arithmetic progression, so you can use the formula for computing the sum of arithmetic progression. Let a_n=3n+5, then the first sum is equal to (a_1+a_75)/2*75. Let b_n=2n, the second sum is equal to (b_101+b_150)/2*50. The...

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