Answer:To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
Explanation:
Mechanical and chemical. Mechanical breaks down food into smaller pieces. Chemical breaks it down into simpler nutrients that can then be used by cells. Hope this helps!
These values are all vectors since they all possess both magnitude and direction.
A mirror equation is an equation that relates object distance and image distance to focal length. The distance of the image from the mirror will be -3 cm.
<h3>What is a mirror equation?</h3>
A mirror equation is an equation that relates object distance and image distance to focal length. It's sometimes referred to as a mirror formula.
![\rm \frac{1}{v} +\frac{1}{u} =\frac{1}{f} \\\\](https://tex.z-dn.net/?f=%5Crm%20%5Cfrac%7B1%7D%7Bv%7D%20%2B%5Cfrac%7B1%7D%7Bu%7D%20%3D%5Cfrac%7B1%7D%7Bf%7D%20%5C%5C%5C%5C)
The given data in the problem is;
f is the focal length = -4. 5 cm
u is the object distance=12. 0 cm
v is the image distance =?
![\rm \frac{1}{v} +\frac{1}{12.} =\frac{1}{-4.5} \\\\ \rm \frac{1}{v}= \frac{1}{-3} \\\\ \rm v= -3cm](https://tex.z-dn.net/?f=%5Crm%20%5Cfrac%7B1%7D%7Bv%7D%20%2B%5Cfrac%7B1%7D%7B12.%7D%20%3D%5Cfrac%7B1%7D%7B-4.5%7D%20%5C%5C%5C%5C%20%5Crm%20%5Cfrac%7B1%7D%7Bv%7D%3D%20%5Cfrac%7B1%7D%7B-3%7D%20%5C%5C%5C%5C%20%5Crm%20v%3D%20-3cm)
Hence the distance of the image from the mirror will be -3 cm.
To learn more about the mirror equation refer to the link;
https://brainly.in/question/31545592