I am plotting a number of y-values that are in the format of mm:ss. I created a trendline to find a correlation between all the values and got

y= 7E-07x^1.1292

for my first x-value, 100, i have a time of 0:10.49, or 10.49 seconds. however, if i put 100 into the formula excel gives me, i get a y-value of 1.269E-04. Is there someway i can convert this number into 0:10.49 or should i re-plot all the times, converting them to just seconds before i do so? any help is appreciated.