Mathematician

It is not two...

THe easiest way to find LCM is to look at prime factors.

28 = 2^2 * 7

84 = 2^3 * 3 * 7

Looking at the prime factors, we see that 84 has all of the prime factors of 28, making it a multiple of 28, so our answer would be 84.

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Explain.

Let's replace _ with "x".

-18/x = 3

-18/x * x = 3 * x

-18 = 3x

-18/3 = 3x/3

-6 = x

We now know that "x" or _ equals -6.

Almost every job requires some type of math, and it is very useful in daily life as well.

On a scientific calculator, a fraction is just a division problem.

Show your steps.

    2(2x + 9) = 6

2(2x) + 2(9) = 6

       4x + 18 = 6

4x + 18 - 18 = 6 - 18

               4x = -12

            4x/4 = -12/4

                 x = -3

Whenever you multiply fractions, just multiply the denominator by the denominator and the numerator by the numerator: (x^2 - 1) * (2) = 2x^2 - 2 and 3 * (x^2 - x) = 2x^2 - 2x, so therefore:

(x^2-1)/3 * (2)/(x^2-x) = (2x^2 - 2)/(2x^2 - 2x)

The 2x^2's cancel eachother out and so do the -2's. So, your simplified expression is 1/x.

-8 + 3/4 * 3

Divide 3 by 4:

-8 + .75 * 3

MUltiply .75 * 3:

-8 + 2.25

Add -8 to 2.25 (subtract 8 from 2.25):

5.75

Just multiply 4 3/8 by 25:

Convert 4 3/8 to decimal: 4.375

4.375 * 25 = 109.375

That was nice... I think I'll accept that name (or that name will be accepted upon me for me.)