Hi there! The answer is 12.6
First we need to change the percentage into a decimal. To convert this percentage, we have to divide it by 100.

Hence, to find 3 percent of 420, we must multiply 420 by 0.03. We get the following:

~ Hope this helps you!
Answer:
the meaning of logarithm is a quantity representing the power to which a fixed number (the base) must be raised to produce a given number.
Step-by-step explanation:
: )
Answer:
=209.09 mg
Step-by-step explanation:
given: material= radium
half life= 1590 years
initial mass
=500mg
we know that to calculate the amount left we use
= 


therefore
= 
=209.09058407921 mg
=209.09 mg amount left after 2000 years
2) would be equal to 19! / 2^9 * 9!
Answer:
8.52x
Step-by-step explanation: