The resistance,R, of a thermistor varies with absolute temperature according to the following equation: R= R0 ek/T I was asked to find the constant k using the graph. I put the equation given in the form ln R= k/t + lnR0 k would be the gradient. So I found the gradient from the graph and I got 2968.80 then I was asked to find Ro so I used a point off the graph and the gradient point (2.88,4.3) 4.3 = lnRo + (2968.80/2.88) => lnRo = -1.031 x 106 then I took anti logs and got Ro = 0 . Which i think is wrong... Guidance appreciated.