# T2-S47 - Name: Northwestern University Id #: Math 230...

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Northwestern University Name: Id #: Math 230 Section 47 Test #2 Fall Quarter 2007 Tuesday, November 13, 2007 Name: Instructions: Show all your work on these sheets. Feel free to use the opposite side. Make sure that your ﬁnal answer is clearly indicated. This test has seven problems. No calculators, books, notes, etc. are allowed. Good luck! Prob. Possible Score points 1 8 2 10 3 20 4 15 5 15 6 10 7 12 8 10 TOTAL 100

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Math 230 Section 47 Test #2 Fall Quarter 2007 Page 2 of 17 BLANK PAGE
Math 230 Section 47 Test #2 Fall Quarter 2007 Page 3 of 17 Question 1. State whether each statement is true or false and brieﬂy explain why. If the statement is false, try to “ﬁx it” by modifying the given statement to a new statement that is true: (2 pts) Quadric surfaces are examples of graphs of functions of two variables. Solution: False, they are not necessarily functions. (2 pts) Level surfaces are traces in planes z = c of the surface z = f ( x, y ) . Solution: False, Level curves are traces in planes z = c of the surface z = f ( x, y ) . (2 pts) If a function f ( x, y ) is continuous on every line through ( a, b ) , then it is continuous at ( a, b ) .

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## This note was uploaded on 11/23/2008 for the course CHEM 210-1 taught by Professor Trzupek during the Fall '08 term at Northwestern.

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T2-S47 - Name: Northwestern University Id #: Math 230...

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