Math 140
Fall 2015
Practice Test #2
Name _
Score_
Please Show ALL WORK for FULL CREDIT!
1. (2 pts) Solve the inequality.
2
5 x +1 ( x6)
3
2. (3 pts) In seawater, the pressure p is related to the depth d according to
33p 18d = 495
Where d is in feet and p

X
0
80
100
250
Total Cost
2560
4000
4360
7060
Revenue
0
4000
5000
12500
14000
12000
10000
8000
6000
4000
2000
0
0
50
100
150
200
# 0f Sweatshirts
Total Cost
Revenue
P
r
o
f
i
t
Loss
150
200
# 0f Sweatshirts
Total Cost
Revenue
250
300

MONTGOMERY COUNTY COMMUNITY COLLEGE
MAT 140
Assignment 6
Name Julia
Average hourly earnings in the U.S. retail trade industry (in current dollars and constant
dollars) are shown in the table.
Year
Current dollars
Constant dollars
a.
1990
4.88
5.70
1995
5.

MONTGOMERY COUNTY COMMUNITY COLLEGE
MAT 140
Assignment 1
Name
Suppose a stereo receiver manufacturer has the total cost function
C(x) = 105X + 1650
and the total revenue function
R(x) = 215X
a.
Find C(15) and write a sentence that explains its meaning.
C(

MONTGOMERY COUNTY COMMUNITY COLLEGE
MAT 140
Assignment 2
Name
A company distributes college logo sweatshirts and sells them for $50 each. The total
cost function is linear, and the total cost for 100 sweatshirts is $4360, while the total cost
for 250 swea

MONTGOMERY COUNTY COMMUNITY COLLEGE
MAT 140
Assignment 4
Name
Mr. Snyder makes pretzels. The cost of making x million pretzels per week is:
C(x) = 0.7x2 + 12x + 125.
The revenue from selling x million pretzels per week is:
R(x) = -0.4x2 + 43x.
The units f

MONTGOMERY COUNTY COMMUNITY COLLEGE
MAT 140
Assignment 3
Name
Suppose that a company has a fixed cost of $150 per day and a variable cost of x 2 + x .
Further suppose that the revenue function is R(x) = xp and the price per unit is given by
p = 57 x. Sket

Chapter 1
Section 1.1
Solution of Linear Equations in One Variable
Equation statement that 2 quantities or algebraic expressions are
equal
Variable a letter, often the letter x, whose value determines
whether the equation is true; also sometimes called th

Section 3.1
Matrix any rectangular array of numbers classified by the
number of rows and columns
A = #rows X #columns
a matrix with m rows, n columns is an
m X n matrix
Order size of the matrix
* 2 matrices have the same order if they have the same
number

Section 2.1
Quadratic Equation in one variable has the GENERAL FORM
ax2 + bx + c = 0
where a, b, and c represent constants
This equation can be solved for x by using any of the following
(Note* x are REAL number solutions only):
1) Factoring Using the zer

Section 6.1
Simple Interest is calculated as follows:
I=Prt
where
I = interest (in dollars)
P = principal amount of money
invested (borrowed)
r = annual interest rate (written
as a decimal)
t = time (in years)
For simple interest, the PRINCIPAL (or face v

Math 140
Fall 2015
Practice Test #1
Name_
Please SHOW ALL WORK for every problem. List any calculator functions used for the
problems.
1. If $1500 is invested at 5 % simple interest for 8 months, find the future value of the
7
8
account after 8 months.
2.

Math 140
Fall 2015
Practice Test #3
Name_
_
Please SHOW ALL WORK for every problem.
1. If the profit from the sale of x units of a product is P = 16x 0.1x2 100, what
level(s) of production will yield a profit of $180? Use the quadratic formula to
solve. S