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Algebra/Questions Answered by Expert David Montiel
| Subject | Date Asked |
| More on dot product.. | 8/23/2011 |
| Q: I just want to thankyou for your previous response to my question. My question is as follows: If ... A: Your example is definitely enough to prove what you want to but yes, there should be a, not more ... | |
| Distributivity with the cross product | 8/16/2011 |
| Q: Here is my question and below it I will show you what I have done: Q: For the following pair of ... A: First of all lets denote the "cross" sign as "*" to avoid confusion with the unit vector "x". For ... | |
| Mirrored Numbers - (Exact Replica of the Number) - Optics & Real Life Use ? | 7/26/2011 |
| Q: What i observe by looking at the Numeric Whole Numbers(Integers) in Mirror (Glass) Object are the ... A: You can definitely say it is a series (whether it's new or not, it's hard to say). Unfortunately it ... | |
| Future Value | 6/27/2010 |
| Q: I want to determine the expanded form for the following: P(1 + r)^3 I think that the answer is as ... A: I'll be glad to help. I think you are just a little confused; the answer you show is correct. So, ... | |
| Percent | 2/15/2010 |
| Q: A stackof wood that is 8 feet long, 4 feet wide, and 4 feet high is called a cord. Mike has a stack ... A: I'm sorry I don't fully understand your reasoning, but yes you should definitely find the volume of ... | |
| common binomial factors | 2/6/2010 |
| Q: okay so I understand this: (x + 2)x + (x+2)(10) but this is what I'm having problems with: PROBLEM: ... A: I don't think the step where you went from: (5y-z) [xsquared - 1 (12x-20)] to: (5y-z) [(x-1) ... | |
| help me please | 1/11/2010 |
| Q: my textbook says to solve this system of linear equations with three variables using linear ... A: Well done! Now you can plug the value of "y" in any of the two last equations you obtained. Note ... | |
| indices | 1/6/2010 |
| Q: If x=4^1/3+4^-1/3 then find the value of 4x^3-12x. tried to rationalise the denominator and ... A: I've got it, it's a bit long. You just have to be careful with laws of exponents. Do you get? 4x^3 ... | |
| Algebra | 11/27/2009 |
| Q: When solving a rational equation, why is it all right to remove the denominator by multiplying both ... A: When you deal with and EQUATION, you can do whatever you want as long as it's done on both sides. ... | |
| Linear Functions and Exponential Models | 11/12/2009 |
| Q: I am having a hard time understanding how to get the linear function y=mx+b out of this table. The ... A: Find the slope for each pair of data. For instance the first pair will be x1=1, y1=3 x2=3, y2=7 ... | |
| urgent math | 11/3/2009 |
| Q: Hey there I have a test tomorrow nigh for Calc and I just can't seem to get the answers for these ... A: This is too long I don't have the time to help you with everything. I will give you some hints to ... | |
| im trying to study for exam | 11/2/2009 |
| Q: i am studying for a vetassess exam and i doing practice questionsi found on there website. i can ... A: I'm a bit confused about the question. Do you mean A=20 - 10/Z2 ? What is Z2 ? or is it Z*2 (Z ... | |
| how to solve (x + 2x^3)^4 = -1 | 10/31/2009 |
| Q: I am stuck on how to start a calculus problem. The problem is to show why the function f(x)=(x + ... A: I'm a little bit confused. Specifically, I don't understand what "a" is. Do you mean: "Show that ... | |
| Algebra1 | 10/28/2009 |
| Q: I am trying to check my son's homework but I'm stuck.It says to find the value of x so the function ... A: If I understand correctly, the question is: Find the value of x such that n(x)=39 given that ... | |
| urgent math | 10/21/2009 |
| Q: I REALLY need to know how to go about finding the inverse of a transcendental function. I have no ... A: Every transcendental function has it's inverse. In the case of trigonometric functions you have ... | |
| trig | 10/14/2009 |
| Q: The function cot 115 degree is equivalent to A: cot 115 degree is equivalent to many things. You would have to tell me in terms of what you want to ... | |
| Weighted Averages | 9/28/2009 |
| Q: I need some clarification regarding the following calculation: (A) 5% X $1000 = $50 (B) 2% X $2000 ... A: I'm not sure I understand the question. Could you be more specific about what you mean by: "This is ... | |
| Hey | 9/25/2009 |
| Q: I'm in deep sh!t right now. I'm in honors 8th grade math. Lets say i bombed 2 quizzes and my ... A: Alex, do you need help with a specific problem or help with the course in general? If you are stuck ... | |
| algebra | 9/23/2009 |
| Q: I'm having a test this friday and we need to know how to write down various representations of a ... A: I copy-pasted your pattern into a text editor and it looks like this (not: actually it doesn't look ... | |
| consecutive number | 9/11/2009 |
| Q: David, I am a cobol programmer and have a unique problem. I want to be able to determine if a ... A: OK, you say you have a 9 digit number so I am going to assume that this is always the case. I'm also ... | |
| Mr.David Montiel, | 9/10/2009 |
| Q: can you please verify why any variable or number having power zero equals to one? A: There are many ways to show this, but I like the following one. I'm assuming you are familiar with ... | |
| math | 9/6/2009 |
| Q: sin(2A)=2sinA cosA =(2sinA cos^2A)/cosA =2tanA/sec^2A =2tanA/1+tan^2A please explain it A: To answer your question we will need a few trigonometric identities; I'll tell you which as we go ... | |
| Linear Algebra | 9/2/2009 |
| Q: I am trying to calculate a complex numbers problem... I need to show that ((-1+sqrt(3)i)/2)^3 is ... A: So you have ((-1+sqrt(3)i)/2)^3 The first thing you should realize is that you can write this as ... | |
| Integration the volume | 8/30/2009 |
| Q: The diagram shows the curve y=(e^-.5x) (1+2x)^.5 and its maximum point M. The shaded region between ... A: Looks like at least your formula is correct. I'm guessing you know that the limits of integration ... | |
| Zeros of the function | 8/29/2009 |
| Q: In this problem i have to solve it algebraically and i do not know how to approach it.Can you please ... A: As you probably know, the zeroes are the solutions of the equation. F(x) = 0 ...(1) In ... | |
| linear algebra | 8/28/2009 |
| Q: Question is show that the curve of intersection of the surfaces x^2+2y^2-z^2+3x+z=1 and ... A: Let me give you a hint: Multiply the first equation by 2. Then substract the second equation from ... | |
| Factoring | 8/27/2009 |
| Q: I'm having some trouble with factoring. I got stuck with this problem 20x^2-93x-34. Can you please ... A: You can always factor an expression like the one above into the form: (cx+b)(cx+a) However it ... | |
| algebra | 8/26/2009 |
| Q: The question is : A local department store is having a coupon sale in which you recieve $30 off any ... A: Before I get to your question, I should let you know that my policy is not to give full solutions ... | |
| help | 8/25/2009 |
| Q: how do you solve 15= -h A: I'm not sure I understand the question. Do you want to find the value of h? If that is the case, the ... | |
| math | 8/24/2009 |
| Q: If x = –1 and y = 2, what is the value of the expression 2x3 – 3xy ? A. 8 B. 4 C. –1 D. –4 E. ... A: Before I get to your question, I should let you know that my policy is not to give full solutions ... | |
| algebra | 8/20/2009 |
| Q: The length of a rectangle is 3cm more than twice the width. The area is 90cm^2. Find the dimensions ... A: That equation is correct, and it can be factored. My first suggestion is that you multiply ... | |
| HELP | 8/17/2009 |
| Q: i have no idea how to solve this problem! please please please help me! if r does not equal + or - ... A: What I meant is writing a polynomial as the multiplication of binomials. Let me give you some ... | |
| differential equation | 8/17/2009 |
| Q: An underground storage tank is being filled with liquid as shown in the diagram.Initially the tank ... A: Did you get that expression from this equation? dt/dh = -20 + 100/(10+h) + 100/(10-h) If you did ... | |
| differential equation | 8/14/2009 |
| Q: An underground storage tank is being filled with liquid as shown in the diagram.Initially the tank ... A: Before I answer I have to tell you that my policy is not to give full answers to problems, or even ... | |
| HELP | 8/13/2009 |
| Q: i have no idea how to solve this problem! please please please help me! if r does not equal + or - ... A: I have the policy of not giving the full solution to problems, but I'll be glad to help you get ... | |
Algebra
Answers by Expert:
David Montiel
Top Expert on this page
Expertise
PLEASE READ THIS BEFORE POSTING YOUR QUESTION: While I am glad to offer HELP with problems, I refuse to SOLVE problems. There is a difference. Please do not just copy a question from a texbook or assignment. I WILL REJECT IT. I will only accept questions if, in addition to the statement of the problem, you describe in detail what you have tried so far in order to solve it, and what exactly is the problem you are encountering. In other words where/why are you stuck? I can answer questions at the level of the first couple of undergraduate years (in science and engineering) or below. You can ask me about algebra, trigonometry, basic probability and statistics, calculus, vector calculus, differential equations and Fourier analysis. I will not answer advanced (at the graduate level) math questions. Questions in Spanish are also welcome.
Experience
Over 8 years of private tutoring in Math and Physics. Five years as a Teaching Assistant in Physics.
Education/Credentials
BSc in Chemical Engineering.
MSc in Chemical Physics.
PhD in Physics.
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