(15)

64

(para 1-19)

(16)

0.622

(para 1-19)

(17)

2,480

(para 1-14)

(18)

100

(para 1-19)

(19)

422.0

(para 1-17)

(20)

0.354

(para 1-15)

a. Algebra is the branch of mathematics used to analyze the relationship of

numbers and concepts with the use of formulas and equations. Algebra is used to find

the value of an unknown factor that is related to known factors. The unknown factor is

usually given the value of "X."

For example: Five times some unknown number is equal to 20. To set this

up as an equation with the unknown factor being X:

5 (X) = 20

b. If two quantities are equal, you may perform identical mathematical functions

to both sides of the equal sign without changing the fact that both sides are equal. If the

factors on one side of the equal sign are multiplied or divided by a number and the

same operation is done to the other side, the resulting factors will be equal. To solve for

X, the X must be isolated on one side of the equal sign. This may usually be

accomplished by dividing both sides by the number in front of X. This number is called

the coefficient of X.

The 5's above and below the line on the left side of the equal sign cancel

leaving:

X = 20

5

c. In general, X can be found by dividing the coefficient of X into the number on

the opposite side of the equal sign.

MD0802

1-24

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