Wirtz Math Finance Chapter 4 Lesson 2

Term Definition
promissory note (p181) An agreement which states the conditions of a loan; a borrower's signature confirms a promise to pay back the loan as outlined in the agreement.
principal (p131, 181) The balance, or amount of money, in an account, or amount borrowed.
annual percentage rate – APR (p143, 181, 201) The interest rate paid per year or charged per year.
cosigner (p181) A person that signs a promissory note along with the borrower and agrees to pay back the loan if the borrower does not.
life insurance (p181) A type of insurance that pays a specified amount upon the policy holder's death.
prepayment privilege (p181) An agreement that allows the borrower to make payments before the due date to reduce the amount of interest.
prepayment penalty (p181) An amount borrowers pay as a fee if they wish to pay back an entire loan before the due date.
wage assignment (p181) A voluntary deduction from an employee's paycheck, used to pay off debts.
balloon payment (p182) The last monthly payment on some loans that is much greater than the previous payments
lending institution (p182) Organizations that extend loans; they make their profit by charging interest, includes banks, savings and loans, credit unions, life insurance companies, and pawnshops.
collateral (p182) Security, such as a personal belonging, car or boat title, CD, or stock certificate, that insures a loan will be repaid.
wage garnishment (p182) An involuntary form of wage assignment, often done by court order.

Wirtz Math Finance Chapter 4 Lesson 3

Term Definition
monthly payment calculator (p187) A way to calculate information about the balance over the lifetime of the loan and on a monthly or yearly basis.
natural logarithm (p189) An exponent of the power to which a base number must be raised to equal a given number.
cubic function (p190) A function or equation raised to an exponent of three.
cubic regression equation (p190) A third-degree regression equation of the form y = ax^3 + bx^2 + cx + d that can be used to determine the loan balance throughout the life of the loan.

Wirtz Math Finance Chapter 5 Lesson 2

Term Definition
statistics (p224) Mathematics that deals with the collection, analysis, and interpretation of numerical facts or data
data (p64, 224) A set of numbers.
measures of central tendency (p224) Single numbers, such as the mean, median, mode, designed to represent a "typical" value for the data.
mean (p196, 225) Often referred to as average; the sum of all the numbers in a data set divided by the number of elements in the data set.
arithmetic average (p225) The sum of all the numbers in a data set divided by the number of elements in the data set.
outlier (p225) Numbers in a data set that are extreme values.
median (p225) the middle number when numbers are in ascending or descending order.
ascending order (p225) Numbers that are in order from the least value to the greatest value.
descending order (p225) Numbers that are in order from the greatest value to the least.
skew (p225) When the mean of a data set is not equal to the median.
resistant (p225) When a value or measure of central tendency does not change easily or significantly due to an extreme value.
range (p70) The set of second elements (y-values) that correspond with a set of x-values.
quartiles (p227) Three values represented by Q1, Q2, and Q3 that divide the distribution into four subsets that each contain 25% of the data.
lower quartiles (p227) Q1 is the first quartile and 25% of the numbers in the data set are at or below Q1.
upper quartiles (p227) Q3 is the third quartile and 75% of the numbers in the data set are at or below Q3.
subscripts (p227) Small numbers, similar to exponents, except in the descending position that are used to name quartiles
interquartile range (IQR) (p227) The difference between the upper and lower quartiles; found by subtracting Q3 – Q1.
mode (p228) The most often occurring value in a data set; there can be more than one mode or no modes at all
bimodal (p228) A set of data that has two modes.

Wirtz Math Finance Chapter 5 Lesson 3

Term Definition
frequency distribution (p232) A table or chart that gives each piece of data in the set and the frequency, or the number of times that it appears in the data set
frequency (p232) The number of times a particular piece of data appears in a set.
stem-and-leaf plot (p233) A type of graph or data display that show frequency; the numbers to the left of the vertical line represent the tens place digit; the numbers to the right of the vertical line represent the digits in the ones place, in ascending order.
box-and-whisker plot (p234) A type of graph that shows are four quartiles and the least number; it is drawn to scale
boxplot (p234) A type of graph that shows all four quartiles and the least number; it should be drawn to scale
modified boxplot (p235) A special type of boxplot that shows all the numbers that are outliers as single points past the whiskers.

Wirtz Intermediate Algebra Red Chapter 1 Lesson 1

Term Definition
Value of the variable (red p1) The numbers that can be represented by the variable
Variable expression (red p1) An expression that contains a variable
Value of the expression (red p1) The number named by the expression
Numerical expression (red p1) An expression that names a particular number
Simplify an expression (red p2) Replacing an expression containing variables by an equivalent expression with as few terms as possible
Substitution principle (red p2) An expression may be replaced by another expression that has the same value
variable (red p1) a symbol or letter used to represent one or more numbers
value of a numerical expression (red p1) the number named by a numerical expression
evaluate an expression (red p2) replacing each variable in a variable expression by a given value and simplifying the result.

Wirtz Intermediate Algebra Red Chapter 1 Lesson 3

Term Definition
equation (red p10) A statement formed by placing an equal sign between two numerical or variable expressions.
sides of an equation (red p10) THE two expressions joined by the equal sign.
open sentence (red p10) A sentence containing one or more variables.
domain of a variable (red p10) The given set of numbers that the variable may represent.
solution or root (red p10) Any value of a variable that turns an open sentence into a true statement.
satisfy an open sentence (red p10) When a solution make the sentence true, it is said to…
solution set (red p10) The set of all solutions of the sentence.
solve an open sentence (red p10) To find the solution set of the sentence.

Wirtz Intermediate Algebra Red Chapter 1 Lesson 8

Term Definition
origin (red p31) The zero point on a number or the intersection of the axes on a coordinate plane.
positive side (red p31) On a horizontal number line, the side to the right of the origin.
negative side (red p31) On a horizontal number line, the side to the left of the origin.
positive integer (red p31) The numbers 1, 2, 3, 4, and so on.
negative integer (red p31) The numbers -1, -2, -3, -4, and so on.
integers (red p31) The set consisting of the positive integers, the negative integers, and zero.
whole numbers (red p31) The set consisting of zero and all the positive integers.
positive numbers (red p31) A number paired with a point on the positive side of a number line.
negative numbers (red p31) A number paired with a point on the negative side of a number line.
graph of a number (red p31) The point on a number line that is paired with the number.
coordinate of a point (red p31) The number paired with that point on a number line.
real number (red p32) Any number that is either positive, negative, or zero
inequality symbols (red p32) Symbols used to show the order of two real numbers.

Wirtz Algebra II Chapter 1 Lesson 2

Term Definition
transformations An operation that maps or moves the points of a figure in a plane.
simplification the process of rewriting an expression in a form that is easier to work with.
inequality a relation that holds between two values when they are different.
number line a straight line with a "zero" point in the middle, with positive and negative numbers listed on either side of zero and going on indefinitely

Wirtz Algebra II Chapter 1 Lesson 3

Term Definition
slope a number that describes both the direction and the steepness of the line
y-intercept the point where the graph of the line crosses the y-axis
slope-intercept form the equation of a straight line in the form y = mx + b where m is the slope of the line and b is its y-intercept

Wirtz Algebra II Chapter 1 Lesson 5

Term Definition
basic function y = x
dilation a transformation of a figure in which the figure stretches or shrinks with respect to a fixed point
reflection a transformation in which a figure is flipped.
line of reflection the given line in which a figure is flipped.