1. J

    One to One Function

    Find all values of k such that f(x) = x^3 + 2x^2 + kx - 1 is one-to-one.
  2. M

    find all values of x where tangent line is horizontal

    f(x)=2x^3+9x^2-60x+4 this polynomial is not factorable.. do I just put no x values as the answer or what should I put Woops.! My bad. I had to derive this whole equation with the power rule of derivative hehe :D
  3. M

    Independent boolean values for Negative Binomial Regression

    Hi, I am trying to analyze some data by using the Negative Binomial Regression. Input for a function of the Python library StatsModels are the independent variable x, containing true (1) or false (0) and corresponding y-values with some double values. Does it make sense to use the Negative...
  4. J

    Combining Std Dev and Mean Values

    I'm wondering if there is a way to combine the data for Machine A and Machine B in the problem below to come up with one data set, i.e. 1 std deviation value and 1 mean value for Machine A and Machine B combined. I was thinking I could just add the mean/std deviation values and get mean =...
  5. E

    Values of Circular Functions

    Hi everyone! I was wondering that for this question: Evaluate sin, cos and tan of: 135º How would you calculate that tan(45)= -1 and cos(45)= -1/2? Where do the negatives come from, yet sin is still positive? Any help much appreciated, Thanks in advance, ~ EbonyJade :)
  6. C

    Finding S and S^-1 in Eigen vectors / values

    Hey Guys, I am a bit stuck on how to get S and S^-1. I understand how to get landa but I don't know how to get the other two matrices as shown.
  7. C

    Two way repeated measures with zeros, non integer values, and non-normal distribution

    I would really appreciate some help with a few models I am trying to run. Essentially my data looks at how often a subject was visited depending on treatment and subject type across two years. The data looks like this: Year | Subject | SubjectType | Treatment | BlockNum | NumberOfVisits |...
  8. O

    Can somebody check my solution: Control Theory with scrap values

    Okay, so I have been working on this problem but want to know if I am correct or on the right lines. I set up the Hamiltonian Took the derivatives with respect to u and x but I am a little unsure about what I do after the boundary conditions and if I am correct with what I did with the scrap...
  9. M

    Please NEED help on quadratic find possible values of k

    hello I am currently studying for an exam (yr11) The question I'm stuck with states that : If 2kx^2-4kx+4k=4x-7 has distinct roots find the possible values of k I have to stick with real number solutions what ive done so far 2k(x2)+(−4k−4)x+(4k+7)=0 Applied the Quadratic Formula, with...
  10. M

    4 positive real-number values of t for which cos t=0

    List four positive real-number values of t for which cos t=0 So we know that cosine is the x-axis. So cosine at 0, and they want me to list four positive real number values? So It could be 0,0 , 0, pi/2, 0,pi , and 3pi/2 The answer in the book has pi/2, 3pi/2, 5pi/2, 7pi/2...
  11. N

    Expected/Actual Values and how to rate them

    Hello all. I am trying to analyze a statistics problem and i am a bit stuck. Any help would be much appreciated. The problem is this. I have a large database of clients of a betting company and the bets each clients has made for a particular time interval (eg 1 year). For every bet made, i know...
  12. M

    Find values for a, b and c

    We know that 31|(5a+7b+11c) Find all the possible values for a,b and c ∈ Z​+
  13. I

    Finding values of power functions from graph

    f(x) in blue has the form f(x) = mx1/4 for some constant 'm' g(x) in red has the form g(x) =kx3/4 for some constant 'k' The two graphs intersect at the point (256, t) marked on the graph, for some constant 't' I need to find numerical values for m, k, t. At first I thought that the power...
  14. P

    Moment Generating Functions values

    I am given the following. $M_x(t) = \frac{1}{9}e^{-2t}+ \frac{1}{5}e^{-t}+ \frac{2}{9}e^{3t}+C$ I am to determine the Value of C. This should equal 1 correct? So the value is $\frac{7}{15}$ But is there an exponential attached to the $\frac{7}{15}$ ? I am asked to get the standard...
  15. E

    limit of absolute values at infinity

    Hello, I am having trouble with this limits question: Evaluate (abs(-x)+abs(3-x))/x as x tends to infinity I know the answer is 2 but I can't seem to solve it. It would be of great help if you could explain it step by step, I would greatly appreciate it!
  16. P

    How do I find the present and future values of this?

    The problem: Find the present and future values of a constant income stream of $100 per year over a period of 20 years, assuming a 10% annual interest rate compounded continuously. Can anybody show me the steps necessary to solve this? I don't even know where to begin.
  17. A

    Finding the values for two unknowns

    Hi all, Can someone please explain how the last four steps where performed? How did x1-x2 become -0.5 ? and how where the value of x1 and x2 found? Thanks in advance.
  18. J

    P values

    I have a a dataset that has already been organised into groups or clusters, however, no formal clustering has been carried out. I have been asked to describe the clusters that they have been out into and to determine whether or not there are any clusters there, so to give a p value to describe...
  19. N

    (x-1)(x-2)(x-3)(x-4)=15, solve for real values of x

    I try expanding it and end up in a fourth degree polynomial. The answer is given as (X +- √21)/2.Please help me
  20. A

    equilibrium values

    Are equilibrium values from both the first and second derivative or just the first derivative?