Mathematics 141 Practice quiz 8 (older format; not self-grading) Note: this practice quiz alone is not sufficient practice for Exam 3 This quiz will not affect your course grade Click on the appropriate answer for each question. When you are sure of your answers, send them to your Professor: see bottom of test Enter your name above Enter preferred email address above Enter student I.D. above
[1] Solve by factoring: 4x2 + 7x - 15 = 0
 x = or x =

[2] Use the quadratic formula to find two values of x which solve the equation:  x2 + 6x + 4= 0

x =   ±

[3] What is the midpoint of the line segment joining (4,-3) and (-5,6):

 (a) (-1, 3) (b) (-4.5, 4.5) (c) (-1.5, 1.5) (d) (-0.5, 1.5) (e) none of the above
[4] Which of the 4 graphs at the right is
the graph of 2x + y + 4 = 0:
Graph
[A]
Graph
[B]
Graph
[C]
Graph
[D]
Graph [A]
Graph [B]
Graph [C]
Graph [D]
Graph [E]
Graph [F]
[5] If ½ = 42x-1, then what is "x":

 (a) ¼ (b) ½ (c) ¾ (d) -1 (e) 0
[6]
 Find the value of log2 ( 18 )

 (a) -3 (b) ¾ (c) 1 16 (d) -1 (e) ¼
[7] Enter the correct integer values of x and y which solve the system in the box:
 2x - y = 3 4x + 2y = -6
 x = y =
[8] Solve the system at the right using GAUSS-JORDAN METHOD:
 2x -  y =  3 4x + 2y = -6
Enter below the entries in the final matrix of your GAUSS-JORDAN solution above:

The final Gauss-Jordan matrix is:
[9]
 John Russell and his wife Jennifer both drove 200 miles from Ventura to their home in Riverside in separate cars. Jennifer took 1 hour less than John, because lighter traffic allowed Jennifer to travel an average of 10 mph faster. How many hours did Jennifer travel?
Using English only, enter a definition for a variable "x":
Let x =
Using information in the boxed problem (above), using "/" for division or fraction lines, and using the variable "x" which you defined above (but no other letters), fill in the table below:
 Distance traveled Travel speeds (rates):expressed using "x" Time traveled:expressed using "x" Jennifer John
Write an equation using one variable "x" which translates the boxed problem above:
[10]
For the problem in the box below, enter the requested information:
 Brent's lunchbox contained only strawberries, oranges, and pretzels. The lunch contained 17 items, twice as many pretzels as strawberries, and 3 more strawberries than oranges. How many of each item were in Brent's lunchbox?
Using English only, enter a definition for a variable "x":
Let x =
Let y =
Let z =
Using information in the boxed problem (above) and/or the variables "x", "y", and "z" which you defined above, write 3 equations which translate the boxed problem above:
1st equation
2nd equation
3rd equation
Enter (in the answer box, right) the number of pretzels in Brent's lunchbox: