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%
The charge of the electrons is
.
The given parameters:
- <em>Number of revolution of the electron, N = 1.4 x 10⁶ rev per sec</em>
- <em>Flux density, B = 10⁻⁵ T</em>
- <em>Mass of electron, m = 9.11 x 10⁻³¹ kg</em>
<em />
The angular speed of the electron is calculated as follows;

The charge of the electrons is calculated as follows;

The charge of the electrons is
.
The complete question here:
Electrons execute 1.4*10^6 revolutions per sec in a magnetic field of flux density 10⁻⁵ T. What will be the value of charge of the electron?
Learn more about magnetic force of electrons here: brainly.com/question/3990732
ANSWER:
For the first picture, it is the first answer. This is because of the Exterior Angle Theorem.
For the second picture, use the Exterior Angle Theorem again, but this time, solve for x.

The m∡B = 39°
Answer:
95
Step-by-step explanation:
(8)(10)+6−27+(5)(8)−4
=80+6−27+(5)(8)−4
=86−27+(5)(8)−4
=59+(5)(8)−4
=59+40−4
=99−4
=95
hope this helped :)