A=P(1/2)^(t/h)
A=final amount
P=initial amount
t=time
h=half life
so
h=1.3 billlion (just write 1.3 and remember to mulipy the end time by 1 billion)
and final amount is 25% of original or 0.25P
0.25P=P(1/2)^(t/1.3)
divide both sides by P
0.25=(1/2)^(t/1.3)
take ln of bot sides
ln(0.25)=ln((1/2)^(t/1.3))
property of logarithms
ln(0.25)=(t/1.3)ln(1/2)
divide both sides by ln(1/2)
(ln(0.25))/(ln(1/2))=t/1.3
times both sides by 1.3
(1.3ln(0.25))/(ln(1/2))=t
remember that this is billion so
(1,300,000,000ln(0.25))/(ln(1/2))=t
2600000000.0001=t
about 2.6 billion years
Answer:
Cellular respiration
Explanation:
Cellular respiration involves the breakdown of glucose using oxygen to produce energy, or ATP, that is used by the cell
The microscope is used to see<span> objects that are too small to be </span>seen<span> by the naked eye.</span><span>
Light Microscopy is the oldest, simplest and most widely-used form of microscopy. Specimens are illuminated with light and are 1000 times magnified.
</span><span>Compound microscopes have a higher magnification and are used to view cells</span>
Answer:
Here's what I get
Explanation:
The image below shows how a topographic map displays contours, contour intervals, and hachure marks.
The contour interval is 20 m and you are on the 340 m contour.
