| Subject | Date Asked | Expert |
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| Graphs of Trigonometric Functions | 11/20/2009 | Paul Klarreich |
Q: Problem #2 - I'm having problems doing this in reverse. Could use some help. Thanks!
A: Questioner: Jill Country: United States Category: Advanced Math Private: No Subject: ...
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| mathematics | 11/20/2009 | Scott A Wilson |
Q: 1. Intergrate with respect to x :(x^2-3) 2. The linear speed of a belt that passes round a pulley of ...
A: 1. ∫(x^2-3)dx The answer would be to add one to the exponent and divide by new exponent. That ...
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| maxima and minima | 11/20/2009 | Sherry Wallin |
Q: pls help me with the following problems. 1) How to find the extreme values and test if they are ...
A: for #1 What is m? Is it a variable or a constant? If it is a constant then take the first partial ...
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| Taylor series and derivative | 11/20/2009 | Paul Klarreich |
Q: 1. Pls help me with the Taylor series expansion around x=2 of y=LOG5 [3^(x+1)] 2. How to solve the ...
A: Questioner: Geli Country: United States Category: Advanced Math Private: No Subject: Taylor ...
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| Maxima or minima in space | 11/19/2009 | Paul Klarreich |
Q: Please help me to solve this problem. Thank you. The function: z=(x-2)^4+(y-3)^4. How to find the ...
A: Questioner: Geli Country: United States Category: Advanced Math Private: No Subject: Maxima or ...
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| rules and function tables homework | 11/19/2009 | Sherry Wallin |
Q: rule: 6+a=b a b 2 10 15 ...
A: Joey, what is that column of numbers? Is that suppose to be values for a? If so, simply take the 2 ...
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| please help soon | 11/18/2009 | Sherry Wallin |
Q: do you know how to find the inverse of the relation {(3,-2),(4,0),(-5,-1),(-1,6)}
A: "In mathematics, the inverse relation of a binary relation is the relation that occurs when you ...
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| Intermediate Value Theorem | 11/17/2009 | Paul Klarreich |
Q: Suppose that the function f is continuous on [a; b], x1 and x2 are in [a; b], and k1 and k2 are ...
A: Questioner: Sam Country: United States Category: Advanced Math Private: No Subject: Prove there ...
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| Exponential function | 11/17/2009 | Paul Klarreich |
Q: I am not exactly sure how to start this prove since it seems so obvious. It is: Prove that if f(x)= ...
A: Questioner: Sally Country: United States Category: Advanced Math Private: No Subject: e^xHi, I ...
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| Trig | 11/17/2009 | Scott A Wilson |
Q: Good evening, my questions are these: 1. How would I verify the identity of; ...
A: 1. Use sin5x = sin(4x+x) = sin4x•cosx + sinx•cos4x, sin3x = sin(4x-x) = sin4x•cosx - sinx•cos4x, ...
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| Subsets | 11/16/2009 | Paul Klarreich |
Q: Consider the following variables: Z A1 ...
A: Questioner: Ryan Country: United States Category: Advanced Math Private: No Subject: Easy ...
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| Easy Counting Problem? | 11/16/2009 | Scott A Wilson |
Q: Consider the following variables: Z A1 ...
A: The counting looked good, and, well, I looked over it, and the only eror I think I saw was when the ...
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| algebra 2 | 11/16/2009 | Ahmed Salami |
Q: Given: root 3 and 5-2i are roots of the equation x^5-9x^4+16x^3+56x^2-117x-87=0. Find the other 3 ...
A: You havent done anything wrong (except maybe making a mistake in the presentation of the ...
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| functions | 11/16/2009 | Sherry Wallin |
Q: If f(x-3)=x^3+2x^2+7x+1, determine f(x) I tried to divide x^3+2x^2+7x+1 by x-3, but my answer was ...
A: What you want is a function that when you evaluate it at (x-3) you get x^3+2x^2+7x+1. Shift our x ...
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| Graph of a parabola. | 11/16/2009 | Paul Klarreich |
Q: I have two rectangles, one inside of the other. The first one has dimensions of x+9 and x+8. The ...
A: Questioner: Katharine Country: United States Category: Advanced Math Private: No Subject: ...
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| #3 Trig | 11/16/2009 | Sherry Wallin |
Q: I'm stuck and need some help.
A: If P1 is on the wheel where it is shown and 2 seconds later P2 is at the top of the wheel then P1 is ...
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| Simultaneous equations | 11/15/2009 | Ahmed Salami |
Q: Ahmed At the tender age of 48 I have decided to do a foundation degree in engineering and have ...
A: 1) Let the number of 50p coins be x and those of 20p coins be y 50p in x places + 20p in y places = ...
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| f(g(x) | 11/15/2009 | Sherry Wallin |
Q: I only have one problem that I don't understand: 6. Confirm that f and g are inverses of eachother ...
A: Celia~ I like to think of finding the inverse as a game and part of that game is substituting ...
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| advanced math | 11/15/2009 | Sherry Wallin |
Q: Pipe A leads into a tank, and Pipe B drains the tank. Pipe A can fill the entire tank in 10 minutes. ...
A: This is a work rate type problem. You know in a work problem that the rate is 1 over the time so if ...
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| rotating | 11/14/2009 | Sherry Wallin |
Q: Please help me. I want to know how to find the coordinates of a point on the circumference of a ...
A: Klaus~ You are rotating clockwise 90 degrees, this means from the point (6,6) in Quadrant I ...
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| Precalculus | 11/13/2009 | Ahmed Salami |
Q: I need help solving this 6 part math problem. The problem is stated as the following: Find the exact ...
A: In quadrant II, sin u and sin v are positive but all of cos u, cos v, tan u and tan v are negative. ...
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| Algebra II.....please help me its urgent!!! | 11/13/2009 | Sherry Wallin |
Q: 6.The magnitude and direction of vectors u and v are given. Find vector w's polar coordinates. u: ...
A: Choose a few questions or I will address a couple. This site (as far as I am concerned) is for ...
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| Utilization | 11/12/2009 | Ahmed Salami |
Q: Dont know if this is the right forum for this. I have a perplexing problem for which I believe only ...
A: 1) Yes, your calculation is correct. 2) Well, there is definitely a flaw in the assumption that ...
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| proofs | 11/12/2009 | Sherry Wallin |
Q: suppose that a and p are natural numbers and that p is prime. are there values of a and p where ...
A: What does it mean to be the greatest common divisor? It means what is the smallest divisor that ...
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| Equivalent Trignometric Functions | 11/11/2009 | Sherry Wallin |
Q: can you help me in this question please? It says choosing appropriate values for A and B, verify ...
A: If you look at what happens in the first quadrant with the sine function and the cosine function you ...
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| calculus | 11/10/2009 | Ahmed Salami |
Q: solve for x. log6(x+2) + log6(x-1)=3 how do you do i solve for x?
A: I'm taking the 6 to be the base of logarithm here. logA + logB = logAB So, log6 (x+2) + log6 (x-1) = ...
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| Pre-calculus | 11/10/2009 | Scott A Wilson |
Q: I need help... I don't understand how to do this problem using the rational zeros thereom to find ...
A: To simplify things, note that every factor is divisible by 3. Thus, 3x^3+6x^2-15x-30 = 3(x³ + 2x² - ...
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| pre calc | 11/10/2009 | Sherry Wallin |
Q: the machine is baught for 1000 dallors and after 5 years value is 100 dallors find a formula for the ...
A: This all depends on if the price depreciates 'linearly' which I am assuming it is so then you have ...
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| trig | 11/9/2009 | Sherry Wallin |
Q: Directions- solve each equation for solutions over the interval [0*,360*] (*=degrees). Give ...
A: What you gave me factors as (cos^2 theta - sin^2 theta) = (cos theta + sin theta)(cos theta - sin ...
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| trig | 11/9/2009 | Scott A Wilson |
Q: Directions- solve each equation for solutions over the interval [0*,360*] (*=degrees). Give ...
A: There is a trig identity involved here. Note that cos(2Θ) = cos²Θ - sin²Θ. So when ...
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| Function Rules | 11/8/2009 | Sherry Wallin |
Q: What is the function rule if x = 5, 10, 15, 20 (that is the easy part) y = 10, 5, 10, 15. I can see ...
A: Penny~ Try plotting the ordered pairs (5,10), (10,5), (15,10), (20,15) to see what shape you ...
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| Pre-Calculus | 11/8/2009 | Sherry Wallin |
Q: I need help with this problem, please: Suppose points A, B, and C have coordinates A (0, 0), B (1, ...
A: u= (1-0,-2-0) = (1,-2) v= (4-1,2--2) = (3,4) cos x = u dot v/|u||v| = 1(3) ...
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| Pre-Calculus | 11/8/2009 | Scott A Wilson |
Q: Scott, I need help with this problem. State an equation whose graph is a transformation of the sine ...
A: The variable is x and the function is sin(x). The amplitude is the value that occurs before the ...
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| Pre-Calculus | 11/8/2009 | Ahmed Salami |
Q: I need help with this project, please: Given that tan theta = 2/3 for an angle Theta in Quadrant ...
A: If θ is in the third quadrant, tanθ is positive and both sinθ and cosθ are ...
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| Ratio | 11/7/2009 | Sherry Wallin |
Q: I have a ratio problem I solved it with 2 ways one I know to be mathematically correct but the other ...
A: I just viewed the video and he is a good math teacher. You want to do what he did with pure math and ...
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| Trig | 11/7/2009 | Sherry Wallin |
Q: I need help with this problem, please! Find the exact value of tan(sin^-1(-square root of 3 divided ...
A: First things first. The sine of angle is a number but the inverse sine of a number is an angle. So ...
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| Chaotic Systems?? | 11/7/2009 | Scott A Wilson |
Q: I was wandering if you could answer myWhat kind of mathematics am I dealing with here? Consider ...
A: That would be a miatrix of almost infinite size with variables for each action somewhere between 0 ...
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| Algebra II.....please help me its urgent!!! | 11/7/2009 | Ahmed Salami |
Q: 21. Find values of a and k for a parabola containing the points given: y - k = a(x + 3)^2; (-5,1) ...
A: 21) y - k = a(x + 3)² At (-5,1) 1 - k = a(-5 + 3)² = a(-2)² = 4a k = 1 - 4a At (1,7) 7 - ...
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| Statistics, probabilities | 11/6/2009 | Scott A Wilson |
Q: There were some other part-questions that I've solved, but I don't know about these, I hope I could ...
A: a) The chance of H is 0.4 and T is 0.6. This is two choices the same for three times. That is the ...
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| Ratio | 11/6/2009 | Sherry Wallin |
Q: I have a ratio problem I solved it with 2 ways one I know to be mathematically correct but the other ...
A: If you are starting with 5 apples and 8 oranges, then why would you begin letting a = total number ...
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