What is 12x8999? pluss 80000000 and subract 3 billion?

Is that possible?

sure it's possible

12*8999 = 107988
+ 80,000,000 = 80,107,988

80,107,988 - 3,000,000,000 = -2,919,892,012

I did it the good ol'fashioned pencil and paper way.

Most calculators do not go beyond 10 digits of display, so you would know how to use scientific notation. But you still would not get the entire sequence of digits

Yes, it's possible, but you'll have a negative number.

Try it yourself.

12 * 8999 = 12 * (9000 -1)

= 108,000 - 12
= 107,988
=1.07988 * 10^5

8*10^7
= 800 * 10^5

-3 * 10^9 = -30,000 *10^5

so what you have is:
(1.07988 + 800 - 30,000)*10^5
=-29198.92012 * 10^5
=-2,919,892,012

That way I could do it with the calculator :)

so whah? What is the A?

Please read the above carefully. Both Reiny and Damon gave you the answer.

Yes, it is possible to find the answer to the expression "12x8999 plus 80000000 minus 3 billion."

To solve this expression, you need to follow the order of operations which is known as PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, and Addition and Subtraction from left to right).

Let's break down the expression step by step:

1. Multiply 12 by 8999:
12 x 8999 = 107,988

2. Add 107,988 to 80,000,000:
107,988 + 80,000,000 = 80,107,988

3. Subtract 3,000,000,000 from 80,107,988:
80,107,988 - 3,000,000,000 = -2,919,892,012

So the answer to the expression "12x8999 plus 80000000 minus 3 billion" is -2,919,892,012.