• Home
• math homework help

# Math Homework Help | Math Assignment Help

## Popular Subjects for Math Homework Help

You can get the best rated step-by-step problem explanations from 65000+ expert tutors by ordering TutorBin math homework help.

Expert help when you need it
• Q1: =) Evaluate \oint_{C}(y \cos (x)-x y \sin (x)) d x+(x y+x \cos (x)) d y where C is the triangle from (0,0) to (0,4) to (2,0) to (0, 0). Show all working.See Answer
• Q2: (3) Find the surface area of the part of the sphere x2 + y² + z² = 4 that lies above the x-yplane and inside the cylinder x² + y² = 1. Show all working.See Answer
• Q3: 6) Let the surface S be part of the sphere x2 + y² + z² = 4 (oriented away from the origin)that lies within the cylinder x² + y² = 1 and above the plane z = 0, and let denote the unit normal vector in the direction of the orientation. Let C be the boundary curve of S, oriented clockwise when viewed from the x-y plane. Consider the vector field F(x, y, z) = xi + yj + xyzk. \text { (a) Evaluate } \oint_{C} F \cdot d r \text { without using Stokes' Theorem. } \text { (b) Evaluate } \iint_{S}(\nabla \times \boldsymbol{F}) \cdot \boldsymbol{n} d S \text { without using Stokes' Theorem. }See Answer
• Q4: \text { Find the rank and nullity of the matrix } A=\left[\begin{array}{rrrrr} 5 & 4 & 3 & 1 & 3 \\ 6 & -4 & -2 & 2 & 2 \\ 3 & 4 & -10 & 4 & 1 \\ 9 & 10 & -18 & 20 & 21 \end{array}\right] \text { . }See Answer
• Q5: 3. (30 points) Consider the characteristics of the following digitalcommunication system. a. (8 points) A signal x(t) is used to transmit bits. Shown below is theFourier Transform, X(f) of the signal shown on a frequency scale. What is the bit rate? b. (4 points) What percentage of the energy is included from the originalcomplete spectrum? c. (8 points) Show the plot of the time domain signal y(t) that wouldtransmit at twice the bit rate as x(t). d. (10 points) Now consider a different signal. What is the maximum bit rate Than can be transmitted over a channel with 100 kHz maximum frequency? 95% of the signal energy is transmitted.See Answer
• Q6: 2. (20 points) Consider the characteristics of the following digitalcommunication system. a. (6 points) A signal x(t) is used to transmit bits at 1 Mbps. Show thewaveform x(t). Remember to label all plots completely. b. (6 points) Show the Fourier Transform X(@). c. (5 points) What bandwidth is needed in order to transfer 95% of the signalenergy? d. (3 points) If instead 20 MHz bandwidth was available, what data rate could be supported with sending 95% of the signal energy?See Answer
• Q7: 3. (20 points) Consider the characteristics of the following communicationsystem. a. (10 points) The following signal is used to transmit bits. What is the bit rate? Note the time scale is in microseconds. b. (10 points) A signal formatted as above is multiplied by a cosine signal andtransmitted at a center frequency of 2.405 GHz. Another signal formattedthe same is also transmitted with the following requirements. • Both signals require 95% of the original signal energy to be transmittedto have tolerable distortion. • All frequencies outside the 95% range are filtered out. • The signals must not overlap in the frequency. What is the next center frequency above this one that can be used to transmit the other signal? Show all significant digits of your answer inGHz.See Answer
• Q8: 3. (2pts) Find an example of a nonlinear equation, which is not solvable using the methods covered in Chapter 2, and which has y = x2 as one of its solutions.See Answer
• Q9: - Consider the Acemoglu, Johnson, and Robinson (2001) data on economic development and property rights from class. a) Regress log GDP per capita in 1995 (logpgp95) on the measure of property rights(avexpr) and report your results. Use hetereoskedasticity-robust standard errors. b) Construct 95% confidence intervals for the intercept and slope coefficients. c) Test Ho : B1 = 0 against Hị : B1 > 0. In answering, be sure to report the test statistic and p-value. d) Test Ho : B1 = 0.5 against H1 : B1 > 0.5. In answering, be sure to report the test statistic and p-value. e) Test Ho : B1 = 0 against H1 : B1 < 0. In answering, be sure to report the test statisticand p-value. f) Test Ho : B1 = 0 against H1 : B1 # 0. In answering, be sure to report the test statistic and p-value. g) Repeat parts b)–f) using homoskedasticity-only standard errors. Do your results change? h) Plot the regression residuals against avexpr. Does this explain your answer to g)?Hint: You will need to use the commandSee Answer
• Q10: a) Regress average test score (testscr) on average expenditure per student (expnstu) and report your results. Use heteroskedasticity-robust standard errors. b) Construct a 95% confidence interval for B1. c) Suppose you learned that test scores and expenditure per student were independent.Would you be surprised? Explain. d) Construct a 95% confidence interval for the predicted effect of increasing expenditure by $1000 per student. e) Test the null hypothesis that the predicted effect is 3 points against the alternative hypothesis that the predicted effect is different from 3 points.Hint: you can use your answer to part d).3 f) A local congressman claimed that increasing per-student expenditure by$1000 would increase average test scores by at least 3 points. Is the congressman's claim valid? Ex-plain.See Answer
• Q11: (5+5 pts) Suppose {an} converges to L. Using only the definition of the limit,show the following: (a) {an} is bounded. (b) {a} converges to L2.See Answer
• Q12: \text { (b) } \sum \frac{2^{n}}{n !} z^{n}See Answer
• Q13: Consider the point A(3,2,-1) and the plane x+2y+2z =8. a) State a unit vector,n, orthogonal to the plane [2 marks] b) Find the distance, D, between the point and the plane [2 marks] c) Find the point on the plane, P, closest to the point A. (Hint, the vector AP is in the direction n) [4 marks] Enter your answer to part b) below stating your answer as a decimal correct to 2 d.p.See Answer
• Q14: Use the "guess" method to solve for x in the following equations. \begin{aligned} &\text { a) }\\ &x^{2}+6 x^{7}-\frac{6-x^{5 / 9}}{\left(x^{2}-1\right)}=47.6 \end{aligned} \begin{aligned} &\text { b) }\\ &\frac{\left(x^{2}+x^{5}\right)}{x^{3}}-1=x \end{aligned}See Answer
• Q15: Q-5: The following points are from a sine curve, what are the y-values for x = -2.35 by using Lagrange interpolation? Plot the data. х= (-5, -4, -3, -2, -1, 0, 1, 2, 3, 4), y =(0.958, 0.757, -0.141, -0.909, -0.841, 0.841, 0.909, 0.141,-0.757, -0.959)See Answer
• Q16: An Easter Egg can be modelled in polar coordinates as: r=\frac{16}{5-3 \sin \theta} b) Hence or otherwise sketch the ellipse indicating all intercepts with the axes and showing all working. [4 marks] \text { a) Convert this into the standard form for an ellipse in terms of } x \text { and } y \cdot \frac{\left(x-x_{c}\right)^{2}}{a^{2}}+\frac{\left(y-y_{c}\right)^{2}}{b^{2}}=1[4 \text { marks }]See Answer
• Q17: Use goal seeker function to solve the following equation. \begin{aligned} &\text { c) }\\ &\frac{6 x^{0.45}}{\sqrt{x}}-x e^{x / 2}+x^{2}=10 \end{aligned} \text { d) Find } \Phi \text { in degrees. } 0.5113=\frac{(\cos \phi)^{2}}{\pi \sin \phi}See Answer
• Q18: Problem 2: Using the initial guesses of x1,0 = x2,0 = 1.2, perform two iterations of the generalized form of the Newton-Raphson method to solve for x1 and x2 in the simultaneous system of nonlinear equations below: \begin{array}{l} x_{2}=-x_{1}^{2}+x_{1}+0.5 \\ x_{2}+5 x_{1} x_{2}=x_{1}^{2} \end{array} Calculate the approximate relative percent error, Ea, for each unknown during each iteration. Place boxes around root estimates and ɛa's. Show all your steps.See Answer

## Student Stories

Tutorbin has got more than 3k positive ratings from our users around the world. Some of the students and teachers were greatly helped by TutorBin.

"They provide excellent assistance. What I loved the most about them is their homework help. They are available around the clock and work until you derive complete satisfaction. If you decide to use their service, expect a positive disconfirmation of expectations."

Willow

"After using their service, I decided to return back to them whenever I need their assistance. They will never disappoint you and craft the perfect homework for you after carrying out extensive research. It will surely amp up your performance and you will soon outperform your peers."

Olivia

"Ever since I started using this service, my life became easy. Now I have plenty of time to immerse myself in more important tasks viz., preparing for exams. TutorBin went above and beyond my expectations. They provide excellent quality tasks within deadlines. My grades improved exponentially after seeking their assistance."

Gloria

"They are amazing. I sought their help with my art assignment and the answers they provided were unique and devoid of plagiarism. They really helped me get into the good books of my professor. I would highly recommend their service."

Michael

"The service they provide is great. Their answers are unique and expert professionals with a minimum of 5 years of experience work on the assignments. Expect the answers to be of the highest quality and get ready to see your grades soar."

Richard

"They provide excellent assistance. What I loved the most about them is their homework help. They are available around the clock and work until you derive complete satisfaction. If you decide to use their service, expect a positive disconfirmation of expectations."

Willow

"After using their service, I decided to return back to them whenever I need their assistance. They will never disappoint you and craft the perfect homework for you after carrying out extensive research. It will surely amp up your performance and you will soon outperform your peers."

Olivia

## TutorBin helping students around the globe

TutorBin believes that distance should never be a barrier to learning. Over 500000+ orders and 100000+ happy customers explain TutorBin has become the name that keeps learning fun in the UK, USA, Canada, Australia, Singapore, and UAE.