Answer:
C.
Step-by-step explanation:
Point lines A and B are pointed in the same each direction.
Point line straight C and G.
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Answer:
a) Two half lives, b) 
Step-by-step explanation:
a) The polonium-210 has a half life of 138.4 days. Therefore, 1.994 half lives have past.
b) Mass decay is described by the following exponential model:

The time constant for the isotope is:


The mass of the isotope after 276 days is:


The answer would be A, Mean
The mean is the Average of a data set.
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Answer:
the horizontal are called x-axis, while the vertical are called y-axis