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 Mathematics 141 Practice quiz 6Functions Submit over the internet When you are sure of your answers, send them to your Professor: Enter your name above Enter preferred email address above Enter student I.D. above

[1] Which of figures below are the graphs of functions :
#1 #2 #3 #4 #5
You must check only those boxes corresponding to functions (no part credit)
 #1 is a function (check if this is true) #2 is a function (check if this is true) #3 is a function (check if this is true) #4 is a function (check if this is true) #5 is a function (check if this is true)

 [2] If f(x) = 3x2 - 2x + 5, then f(-2) = ?

 [3] If f(x) = 2x + 5, then f(x-4) = ?

[4] If f(x) = 3x2 - 6x + 5, then f(1 +
 2
) = ?

[5] Name the domain and range of the function : f(x) = | x-2 |
 (a) domain and range are both the set of all real numbers (b) domain is the set of positive real numbers; the range is the set of all real numbers (c) domain is the set of all real numbers; the range is the set of positive real numbers (d) domain is the set of all real numbers; the range is the set of non-negative real numbers (e) domain and range are both the set of all positive real numbers

[6] Enter decimals below in the table of values for the function : f(x) = 3x2 - 6x + 5

x 1
2
 1 + 2
4
f(x)
All 3 decimal values must be correct to receive credit

[7]
 "1% milk" contains 1 part dissolved butterfat per 100 parts milk. How many liters of 1% milk must be added to 5 liters of 2% milk to obtain a mixture which is 1¾% (1.75%) butterfat ?
Which of the following defines a variable x suitable for solving the boxed problem above?

 (a) Let x = 1% milk (b) Let x = number of liters of 1¾% milk (c) Let x = number of liters of 1% milk added (d) Let x = amount of butterfat in the 1¾% milk (e) Let x = amount of butterfat in the 1% milk (f) Let x = number of liters of 2% milk (g) Let x = amount of butterfat in the 1¾% milk

[8]
 "1% milk" contains 1 part dissolved butterfat per 100 parts milk. How many liters of 1% milk must be added to 5 liters of 2% milk to obtain a mixture which is 1¾% (1.75%) butterfat ?
Using the correct definition of x in problem [7] above, enter numbers or expressions involving x
which correctly translate the information in the boxed problem above.
use decimals rather than fractions. Each table row worth ½ point

 1% milk 2% milk 1¾% milk Total volume in liters Volume of butterfat only

[9]
 "1% milk" contains 1 part dissolved butterfat per 100 parts milk. How many liters of 1% milk must be added to 5 liters of 2% milk to obtain a mixture which is 1¾% (1.75%) butterfat ?
Write an equation using the bottom row of the table you created in problem 8 above, and solve this equation, thus answering the question in the boxed problem..
The number of liters of 1% milk needed is x =

[10]
Use your mouse to move the red line, producing a graph of the function y = 2x + 4 ; to preserve your chosen graph, slide your mouse off the bottom edge of the graph
 The graph requires Netscape 3.0+ or I.E. 4.0+

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