# Past Exam for MATH 113 - COLLEGE ALGEBRA & TRIG at Maryland (UMD)

## Exam Information

 Material Type: Exam 3 Professor: Staff Class: MATH 113 - COLLEGE ALGEBRA & TRIG Subject: Mathematics University: University of Maryland Term: Fall 2004 Keywords: UnauthorizedProvided ThatInstructionsRepresentativeCalculatorsUnauthorized AssistanceInequalitiesFollowing MatrixDecimal PlacesNatural Logarithms

## Sample Document Text

A Dec. 3, 2004 MA,.H I I i - ,.ES,. i NAME: _______ _ (4.3-6.3) SECTION: ____ _ Instructions: Do all problems in the spaces provided. Mark your answers clearly and write them in simplified form. You must show all appropriate work in order to receive credit for an answer. You may use graphing calculators, but show work algebraically and find exact answers where indicated. 1. The amount of money, A, in an account after t years, invested at a rate, r, is given by : A = 5400e· 05t (a) What was the amount of the original investment? [6] (b) Determine the length of time it will take the original investment to triple. [8] 2. An inheritance of \$50,000 was divided among three investments yielding a total of \$3940 in interest per year. The interest rates for the three investments were 5%, 7% and 10%. SET UP the system of 3 equations you would need to find the amount of money placed in each investment if the 10% investment was twice as much as the 7% investment. SpecifY clearly what ea...

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