1. LINE GRAPHS: Line graphs are used when we compare two different number values. 1.1. Draw two graphs on the same set of axes showing the changes in heart rate of two boys. Jor and Thabo, as they run over a certain distance. 70 Distance run (m) John's heart rate Thabc's heart rate (beats per minute) (beats per minute) 0 60 100 75 80 200 85 90 400 100 110 800 120 1500 115 120 130

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Ions gain or lose electrons

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.