Let's Check In Most electricity is generated using
A. petroleum
B. oil
C. coal
D. natural gas
Please select the best answer from the choices provided
OA

Most electricity is generated using oil.

Explanation:

A is not correct because despite being used for the production of electricity it is nowhere near the top.

B is correct because the oil is the most used resources for the production of electric energy, accounting for around 39% of the global production.

C is not correct because the coal has dropped off significantly in its usage because of the heavy pollution.

D is not correct because the natural gas despite being among the leading ones, it is still nowhere near the first place.

This system have 9000 different numbers.

Step-by-step explanation:

We know that the internal telephone numbers in the phone system on a campus consists of 4 digits, with the 1st not equal to 0.

We have total 10 digits.

In the first place we have 9 possibilities, because from the conditions of the task in the first place there cannot be 0.

In second, third and fourth place we have 10 possibilities.

Therefore, we get

This system have 9000 different numbers.