1.5 Change in a Quantity and Subtracting Real Numbers
Change in a Quantity
Change in the quantity = Ending amount Beginning Amount
Subtracting a Real Number
To subtract a number, add its opposite
a b = a + (-b)
Changes of Increasing and Decreasing Quantit
Expression: A constant, a variable, or a combination of constants, variables,
operation symbols, and grouping symbols, such as parentheses.
Evaluating an Expression: Substituting a number for each variable in the
expression and then calcul
1.4 Absolute Value and Adding Real Numbers
The Opposite of a Number
Two numbers are called opposites of each other if they are the same
distance from 0 on the number line.
Finding The Opposite of a Number
The opposite of the opposite of a number is equal
1.3 Operations with Fractions and Proportions; Converting Units
Meaning of a Fraction
A fraction can be used to describe a part of a whole.
- = 8 4 = 2
Division by Zero
The fraction a/b is undefined if b=0. Division by zero is undefined.
1.1 Variables, Constants, Plotting Points, and Inequalities
In arithmetic, we deal with numbers. In algebra and statistics, we work with
variables as well as numbers.
Variable: a symbol that represents a quantity that can vary.
ex. The number of