Chapter 2

Question 1

Variable:

Answer 1

Is a symbol, usually a letter used in place of an unknown quantity.
Ex. A=B↔️A=B
Ex. 2x=5=13

Question 2

Variable expression:

Answer 2

Is a (grammictically correct) combination of #, variables and/or operations.
Ex. No equal sign =
Can’t solve this
Can simplify it

Question 3

Term:

Answer 3

Are addends in an expression.

Question 4

The Numeric factor:

Answer 4

In term is called a coefficient.

Question 5

A constant:

Answer 5

Term is a term without a variable part.

Question 6

Box Volume:

Answer 6

V=l•w•h or V=b•h

Question 7

Cylinder volume:

Answer 7

V=π•r®•h

Question 8

Cone Volume:

Answer 8

V=1/3•b•h

V=1/3•π•rª•h

Question 9

The commutative properties:

Answer 9

Can we change the order of the number in operation without changing the result?
Commutative properties of Addition & Multiplication:
For all Real #: A+B=B+A, For all Real #: A•B=B•A
Subtraction and Division aren’t Commutative.

Question 10

The Associate Properties:

Answer 10

Can we change the grouping of the number in the operation without changing the result?
The associative property of Addiction and Multiplication
For all real # A,B&C, For all real # A,B&C
(A+B)+C= A+(B+C), (A+B)+C=A+(B+C)
Subtraction and Division are not Associative.

Question 11

The Identity Properties:

Answer 11

Is there a neutral # for the operation?
The Additive and Multiplicative Identity
For all real # A, For all real # A,
A+0=A=0+A. A•1=A=1•A
0 is additive identity, 1 is the multiplicative Identity
Subtraction and Division have no Identity.

Question 12

Inverse Properties:

Answer 12

How do we get back to the operations Identity?
Additive Inverses ( or Operations)
For all real # A&-A are the additive inverses
Because A+(-A)=0=(-A)+A
Multiplicative Inverses( or Reciprocals)
For all real # A(A≠0), A&1/A are multiplicative inverses
Because A•1/A=1=1/A•A

Question 13

e·val·u·ate

Answer 13

find a numerical expression or equivalent for (an equation, formula, or function)