# Exponential graphs

#### clarehoy

##### New Member
Have plotted curve with concentration /cm3 (y-axis) V time/s (x-axis). Need to calculate half lives by taking a value on y-axis across to curve and obtaining value in seconds. The needs to be repeated by halving the value of concentration on y-axis each time. Is it possible to to take a value acroos to curve ? Am I using correct chart type(exponential)?

### Excel Facts

Difference between two dates
Secret function! Use =DATEDIF(A2,B2,"Y")&" years"&=DATEDIF(A2,B2,"YM")&" months"&=DATEDIF(A2,B2,"MD")&" days"
Why not use the curve's equation to get the exat time? You can easily do this in Excel.

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