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Unformatted text preview: Math 10B Test 2 100 pts November 23, 2009 Professor Evans Directions: Answers alone are not sufficient. Show all work. Each problem is worth 20 points. (1) On January 2, 2008, Jack was given a $100 savings account and Jane was given a $60 savings account. On January 2, 2009, Jane was given another $60 savings account. The accounts pay an annual interest rate of 50%. True or False : If Jack and Jane withdraw their money on January 2, 2010, they will each have the same amount. Justify. Solution: Jack ends up with 100(1 . 50) 2 = 225 dollars. Jane ends up with 60(1 . 50) 2 + 60(1 . 50) = 225 dollars. Hence the answer is True. (2) The base of a loaf of bread is the region inside the circle x 2 + y 2 = 1. Each crosssection perpendicular to the xaxis has the shape of a square. (Think of paperthin squareshaped slices of bread.) Find the volume of the loaf of bread. Hint : The answer is between 1 and 8....
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This note was uploaded on 09/13/2010 for the course MATH math 10b taught by Professor Reed during the Summer '10 term at UCSD.
 Summer '10
 reed

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