Math 217
Practice Problems (with answers)
Spring 2014
1. A 6 foot tall man is walking away from a 24 foot light post at 3 ft/sec. The light casts
a shadow on the ground that gets longer as the man walks away. When the man is 30
feet from the light post, h
Math 217
Sample Exam 2 (with answers)
Spring 2014
1. [10 points] Suppose a sample of some radioactive element decays to 47% of its original
amount in 5 days.
1. What is the half-life of the element?
2. If the sample contains 200g of the element initially,
Dierential Equations (Math 217) Exam 1 September 18, 2003
This exam contains ten multiple-choice problems worth two points each, ve true-false problems
worth one point each, and four computational problems worth 25 points altogether, for an exam
total o
Differential Equations (Math 217) Exam 1 February 10, 2004
This exam contains ten multiplechoice problems worth two points each, ve true-false problems
worth one point each, and four computational problems worth 25 points altogether, for an exam
total of
Math 217
Sample Exam 2
Spring 2014
1. [10 points] Suppose a sample of some radioactive element decays to 47% of its original
amount in 5 days.
1. What is the half-life of the element?
2. If the sample contains 200g of the element initially, how much will