Answer: 
Explanation:
If we have an initial amount of a radioactive material or substance, which is
, and we also are told this amount decays
each year, this means each year
of the substance remains:

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<u>To understand it better:</u>
Year 1: 
Year 2: 
Year 3: 
and so on until year
:
Year t: 
Therefore, the function tha best describes this radiation decay situation is:

Answer:
16.64 km/h
Explanation:
Think of the x and y components as the a and b sides of a triangle and simply do the Pythagorean Theorem:





Answer: B: It can be made out of wire
Explanation: i just had this question and put this answer and gotten it right:)