Spring 2006 Math 80 Exam 3 150pts Show work for credit BOX ANSWER! Name______

I. Simplify the rational expressions. (a,b 3pts, c=4pts)

a) b)

c)

II. Find the domain for each function.(3pts each)

a) b) c)

______

III. Determine the LCD, then add/subtract and simplify.( 5pts each)

a) LCD = ______b) LCD = ______

c) LCD = ______d) LCD = ______

Page 1 10/23/2007

Spring 2006 Math 80 Exam 3 150pts Show work for credit BOX ANSWER! Name______

Page 1 10/23/2007

Spring 2006 Math 80 Exam 3 150pts Show work for credit BOX ANSWER! Name______

IV. Determine the LCD, any restriction(s), then solve.(5pts each)

a) LCD = ______b) LCD = ______

restriction(s): restriction(s):

Page 1 10/23/2007

Spring 2006 Math 80 Exam 3 150pts Show work for credit BOX ANSWER! Name______

c) LCD = ______

restriction(s):

V. Solve for the indicated variable.(5pts)

a) for

VI. (5pts) Dr. Dre can type 46 words per minute. How many words would he type in ¼ hour (15min)?

VII. Simplify. (2pts each)

a) b) c) d)

XIII. Simplify the radicals. Assume all variables represent positive real numbers.(3pts)

a) b) c)

d) e)

IX. Simplify completely. (2pts each)

a) b) c) d)

e)

X. Write in form with positive exponents.(2pts each)

a) b) c)

d)

XI. Simplify. Express answers with positive exponents. (4pts each)

a) b)

c) d)

XII. Rationalize the denominator.(5pts)

a)

XIII. Multiply, add or subtract, rationalize.(4pts)

a) b) (8-3i)(2+5i)

c)  (7+8i) - (-6+i) d)

XIV. Graph the function and give the domain and its range.(8pts)


D:
R: /

Extra credit, 8 pts , pick ONE and circle it !

1)  The speed of a stream is 5mph. If a boat travels 52 miles downstream in the same time that it takes to travel 26 miles upstream, what is the speed of the boat in still water. ? Set up 4 pts, solving and answering the problem 4pts

Distance / Rate / Time
Downstream / 52miles
Upstream / 26miles

2)  Solve the equation:

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