Answer:
It's proportional when you have a straight line that goes through the origin, meaning (0,0), meaning x = 0 and y = 0, meaning: when x = 0, then y has to be = 0 too! That's obviously not the case here. You can see that the line hit the y axis way above 0. So this graph is not directly proportional to x.
Step-by-step explanation:
Answer: 100
Step-by-step explanation:
Answer:
1/243, 1/729
Step-by-step explanation:
it's a geometric series so successing term increases exponentially
Half-Life = ln (.5) / k
Half-Life = .693147 / .00011
Half-Life =
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6,301 years
For a radioactive substance to decay to 25%, it has to go through 2 halflives.
2 * 6,301 = 12,602 years
approximately 12,600 years
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