Identical good tomatoes are placed in a 4 by 4 tray

Each tomato is a circle.Each tomato just touches all the tomatoes next to it as shown in the diagram.The tomato highlighted goes bad.One hour later, all the tomatoes it touches go bad.After another hour, the bad tomatoes make all the good tomatoes they touch go bad.This continues until all the tomatoes in the tray go bad.

The first part of this project is to investigate how tomatoes in the tray go bad.The second part of this project is to investigate how tomatoes in other trays go bad.Part 1There are 3 different positions for the tomatoes to start going bad.The first position is anywhere in the middle of any side:As you can see, the first tomato to go bad is the one coloured black. And then the tomatoes it touches go bad until all the tomatoes in the tray have gone bad.Also it doesn’t matter which side the tomato starts going bad as long as it’s in the middle and on the side.

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A table can be drawn from this for analysis and to generate a formula:Number of hours ( )012345Number gone bad ( )134431Total number gone bad ( )148121516As you can see, the number gone bad are symmetrical. I worked out the total number gone bad using the ‘cumulative frequency method’-: 1; 1+3=4; 4+4=8; 8+4=12; 12+3=15; 15+1=16A graph can be drawn for both the number gone bad and the total number gone bad:As you can see from the graph, the relationship between x and z seems to resemble a cumulative frequency curve. This is interesting because the total number gone bad was calculated using the ‘cumulative frequency method’. But there is a relationship between x and y.

This can be modelled by a quadratic equation since it is a quadratic curve:The second position is any corner of the tray:A table can be drawn from this for analysis and to generate a formula:Number of hours ( )0123456Number gone bad ( )1234321Total number gone bad ( )13610131516As you can see, the number gone bad are symmetrical. I worked out the total number gone bad using the ‘cumulative frequency method’-: 1; 1+2=3; 3+3=6; 6+4=10; 10+3=13; 13+2=15; 15+1=16A graph can be drawn for both the number gone bad and the total number gone bad:As you can see from the graph, the relationship between x and z seems to resemble a cumulative frequency curve. This is interesting because the total number gone bad was calculated using the ‘cumulative frequency method’. But there is a relationship between x and y. However, this is not a quadratic curve.

There appears to be a linear relationship between x and y. But this linear relationship has 2 parts. So in effect there are two straight-line graphs. One is from 0 ? x ? 3 and the other is from 3 ? x ? 6.So therefore there’ll be 2 equations – one for each part. These can be modelled by a linear equation since it is a linear graph:The third and final position is anywhere in the middle:A table can be drawn from this for analysis and to generate a formula:Number of hours ( )01234Number gone bad ( )14641Total number gone bad ( )15111516As you can see, the number gone bad are symmetrical.

I worked out the total number gone bad using the ‘cumulative frequency method’-: 1; 1+4=5; 5+6=11; 11+4=15; 15+1=16A graph can be drawn for both the number gone bad and the total number gone bad: