Answer:
Step-by-step explanation:
How to write numbers in standard form:
Write the first number 8.
Add a decimal point after it: 8.
Now count the number of digits after 8. There are 13 digits.
So, in standard form: 81 900 000 000 000 is 8.19 × 10¹³
Here we have a system of equation like this:

from the first equation we get:

Substitute in the second equation we get:

Substitute i the first equation again we get:

We deduce that:

A is bigger than B.
A number patter is a list of numbers that follow a certain pattern like 2,4,6,8,10 is a pattern of 2's
A square has two parallel sides and four right angles.
Answer
it is the 3rd one I believe sorry if you got it wrong thought
Step-by-step explanation:
I think you can find the explan on g00gle or on your notes if you write any