Answer:
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Answer: 8
Step-by-step explanation: 8 divided by 1 is 8
So... hmmm if you check the first picture below, for 2)
we could use the proportions of those small, medium and large similar triangles like

now.. for 3) will be the second picture below
So.. in this case, the starting amount is the 500mg sample... and the rate of decay, negative rate, is 1%, and at the time, the elapsed days is 0, to t = 0, P = 400
Pi is an irrational number meaning it has no end, 3.14 is just an estimate which means that it is not accurate.