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Class notes

IGSCE Mathematics

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These notes include sources drawn and explained by external professors, have tricks and simplified methods and study guides and explanations for each individual type of question.

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  • April 12, 2021
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  • 2020/2021
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  • Megan
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By: Schalwyk95 • 3 year ago

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pablorothbart
Maths lesson 6
Exponential Growth and Decay
Growth and decay
- Formula: Original x Multiplier ⁿ

Water bodies typically support a large number of different plants, however if they become
polluted the number of organisms they support are decreased by 30% each month. If a lake has
15 000 organisms, how many after 6 months.

15000 x 0.76
= 1764.7
= 1760

Newton has 23 000
Population decreases at 1.4% a year
Calculate population after 5 years

(100-1.4) / 100
= 0.986
23 000 x 0.9865
= 21434.45329
= 21400


Inequalities




I

, Sets and Venn Diagrams

- Sets = collection of items
- Element = an time in a set




n(P) - P is the number of elements in the set




Venn diagram is drawn as a square to represent the Universal set.
All other sets are drawn as circles.

Subsets vs Proper sets
Proper subsets do not have all the elements of the original set.

X’ - the apostrophe means everything that's not in X

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