1. ## Growth Rate

Time(min) Length
0 12.5mm
5 30mm
10 50mm

How can i work out the growth rate per minute?

2. Hello el123
Originally Posted by el123
Time(min) Length
0 12.5mm
5 30mm
10 50mm

How can i work out the growth rate per minute?
With more data, you could plot a graph, and draw tangents to the graph at the points where you wanted the growth rate. However, with this small amount of data, you can only work out average rates - there's not really enough data to plot a graph.

In the first $5$ minutes the length has increased by $30-12.5 = 17.5$ mm. So the average rate during this period is $\frac{17.5}{5}= 3.5$ mm per minute.

In the second $5$ minutes, the length has increased by ...? So the average growth rate is ...?

And, overall, in $10$ minutes the average growth rate is ... ?

Can you complete the calculations?