K
krodda

  • Joined Feb 23, 2023
  • In Methods Question thread

    PhytoPlankton

    Thank you so much for trying😭 I have checked with my teacher and my equations are correct, so I am so confused on what is going wrong. There has been so much controversy about our assessment this term as even some of my classmates' tutors can't help them solve it.

    I think maybe they are reviewing the assessment to see if it is actually possible, but for now I am just going to try and solve it by assuming some of the parameters, partial marks is better than none I guess. Once again thanks so much for taking your time to help me, I'll see how this goes (it's due next wednesday).

    • In Methods Question thread

      PhytoPlankton

      Thanks so much! I do unfortunately have to show algebraic working, but I don't know how to post a picture, it wont let me, so I will try and type it out! If this helps, my teacher said that we can assume the parameter d as -1, for it to pass through the origin to make it easier, but we will get marked down, and I'm not sure I am willing to risk that many marks.

      [1] 32=ae^(b(140-c))+d
      [2] 64=ae^(b(190-c))+d
      [3] 113=ae^(b(240-c))+d
      [4] 180=ae^(b(290-c))+d

        • In Methods Question thread

          How do you do simultaneous solutions with four exponential equations?
          I'm currently doing my year 11 Methods IA1, and I need to find an exponential model for a set of data points with the equation y=aeb(x-c)+d. Using four data points, I need to sub them in to get four equations then solve simultaneously for the parameters. I was okay doing them with the cubic equation, but when it came to exponentials, I was completely lost. My teacher held tutorials, but wouldn't explain it to us one bit, kinda frustrating, and no one I know, not even my older sibling know how to approach it. Please send help