For question #a#, the conversion from centimetres to millimetres is shown by this picture: http://www.mathsmutt.co.uk/files/measurement.htm
So 1cm = 10mm, and 1mm=0.1cm. Therefore, 4.1 cm equals #4.1*10=41mm#
The conversion from days to seconds is shown by:
This mean 1 days is equal to #1*24*60*60=86400s#. The last thing to do is to divide the millimetres by the seconds, so that we get #41/86400==0.0004745370=4.745370*10^-4# millimetres of sweet corn per second.
For question #b#, the conversion from centimetres to feet is #1cm=0.0328084f#, and #1f~~30.48cm#. Therefore, to find how much feet are in 4.1 centimetres, you do #4.1*0.0328084=0.13451444f#.
Next, you realise that there are 7 days in a week, so the sweet corn growth rate currently looks like #0.13451444f##/(1/7)w#. The last thing to do is to multiply both sides by 7, so we get #0.13451444*7=0.94160108f##/w#, the answer to question #b#.
