Answer:
Step-by-step explanation:
(x+a)^n=nc0 x^n+nc1x^{n-1}a+nc2 x^{n-2} a^2+...+ncn a^n
Answer:
soil covered in grass because the soil is able to hold plenty of water while dry soil is lose and has cracks. lots of cracks.
Step-by-step explanation:
This is the concept of arithmetic. To calculate the percentage of time life has existed we proceed as follows;
According to history:
The age of earth is 4.6 billion years
the age of life is as it appeared from unicellular is 3.8 billion years.
thus the percentage of the above will be:
3.8/4.6 x 100
=0.82609x100
=82.609%