Online TA Profiles
Yupei Xiong, PhD
OTA ID#: 101298
| Education Experience: |
BSc, Mathematics, Peking University, 1996 MA, Mathematics, Peking University, 1999 PhD, Mathematics, University of Maryland - College Park Campus, 2004 |
|---|---|
| Focus of Study: | Applied Mathematics and Computer Science | Outside Interests: | Software |
| Postings Answered: | 3921 |
| Cumulative OTA Rating: | 4.8/5 What is OTA Rating? |
- Matrices, Sets and Relations - Let: D = days of the week {M, T, W, R, F}, E = {Brian (B), Jim (J), Karen (K)} be the employees of a tutoring center at a University U = {Courses the tutoring center needs tutors for} = {Calcu ...
- Automorphism - Please show all work. Thanks See attached Task: Prove the following theorem: is an automorphism of under componentwise addition. Additional Notes on the Task: Be careful not to c ...
- Weekly pay in Java - Create a non-GUI based Java application that calculates weekly pay for an employee. The application should display text that requests the user input the name of the employee, the hourly rate, and the ...
- Finite Math - (See attached file for full problem description) --- 1. What is marginal cost? Fixed cost? Find the slope for each line that has a slope. 3. Through (-2, 5) and (4, 7) 5. Through the origin ...
- Functions - Suppose you throw a baseball straight up at a velocity of 64 feet per second. A function can be created by expressing distance above the ground, s, as a function of time, t. This function is s = -16t2 ...
- Evaluating Functions for Given Value of X. - Evaluate the functions for th values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x (i.e. is there a pattern in the c ...
- Java - Quadrilateral, etc. - Write an inheritance hierarchy for classes Quadrilateral, Trapezoid, Parallelogram, Rectangle and Square. Use Quadrilateral as the superclass of the hierarchy. Make the hierarchy as deep (i.e., as man ...
- Two-Dimensional Cartesian Structure - Hi, I need assistance in the following problem. One of the problems of storing data in a matrix (a two-dimensional Cartesian structure) is that if not all of the elements are used, there might b ...
- Java - I have to write a Java program that meets the following requirements: Declare a method to determine whether an integer is a prime number Use the following method declarations: public static Bo ...
- Java Program for Payroll of hourly, salaried and salary with commission employees - Write an employee payroll program that uses polymorphism to calculate and print the weekly payroll for your company. There are three types of employees ─ hourly, salaried, and salaried plus comm ...
- Develop probability tree and Joint probability table - A school system consists of three districts, north, south, and central. The North contains 25% of the students, the south contains 40% and the central contains 35%. A minimum competency test was given ...
- Applications of Derivatives Word Problems : Maximizing Volume of an Open-Top Box - An open top box is to be constructed from a 6 by 8 foot rectangular cardboard by cutting out equal squares at each corner and the folding up the flaps. Let x denote te length of each side of the squa ...
- Can you give a real-world example when the solution of a system of inequalities must be in the first quadrant? - Can you give a real-world example when the solution of a system of inequalities must be in the first quadrant?
- Two distinct, nonparallel lines are tangent to a circle.... - Two distinct, nonparallel lines are tangent to a circle. The measurement of the angle between the two lines is 54° (angle QVP). Suppose the diameter of the circle is 2cm. What is the distance VP? ...
- Combinations - A women has 9 close friends. (a) In how many ways can she invite five of these to dinner? Explain/Show work. (b) Repeat part (a) with the added stipulation that two of her friends do not like ...
- Quadratic Expression : Application to Ticket Sales - Please see the attached file for the fully formatted problems. Ticket Sales Living in or near a metropolitan area has some advantages. Entertainment opportunities are almost endless in a major c ...
- Probability / Statistics : Combination Application Word Problems - In a marketing survey, consumers are asked to give their first three choices, of 9 different drinks. In how many different ways can they indicate their choices? Find the present value of an ordina ...
- Matrices : Row Echelon Forms and their Solutions, Subtraction, Multiplication and Inverses - Indicate whether the reduced row-echelon form of each augmented matrix has one solution, no solution, or infinitely solutions. Please see the attached file for the fully formatted problems.
- Abstract Algebra (4 year College) - I had to prove 4 theorems two of them dealt with Abelian elements, automorphism of R2 under compontentwise addition. I want to keep my original work in tack as possble BUT I would like the follwing c ...
- Programming - Cat.java Class File - I need some help with writing this program. In the attached document are all the instructions also a sample of the program to be edited. Hopefully that helps, I'm just at the point to where I'm not ...
