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
Answer:
180 miles
Step-by-step explanation:
just multiple 45X4
Answer:
c
Step-by-step explanation:
x<=-2
Answer:
<em>( About ) % 31.58</em>
Step-by-step explanation:
Consider the procedure below;

<em>Thus, solution; ( About ) % 31.58</em>