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1078Midterm1Spring2005(2)

# 1078Midterm1Spring2005(2) - Name ID Econ1078 Math Tools for...

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Name: ________________________________ ID:___________________ Econ1078 Math Tools for Economists I Midterm1 February 21 st , 2005 There are 6 problems. Answer the questions in the spaces provided. You must show all the steps to get full credit. You have 50 minutes to finish the exam . 1.State whether the following statements are Multiple choice and Fill in the blanket (24 points) a. If a line, A, is perpendicular to 4x-2y=10, and the y-intercept of this line is 7. Write out the equation of line A. ___________________________________________________________________. _________ b. The result of simplifying 2 ) 5 ( 2 ) 5 7 )( 5 7 ( n m n m n m + + - + is A. 2 2 41 20 38 n mn m + + B. 2 2 50 38 n m + C. 2 2 47 20 8 n mn m + + D. 2 2 51 20 25 m mn n + + __________ c. What is the domain of the function: 2 ( ) 3 f x x = + ? A. All the real number B. x -3 C. x 3 D. x 0 __________ d. Solve for the value of x: 2 ( 1) 49 x + = A. 8 B. 6 C. 6, -8 D. -6, 8 __________ e. What’s the vertex coordinate of the quadratic function: 2 ( ) 2 12 7 m x x x = - + + A. (3, 25) B. (25,3) C. (0,7) D.(7,0) __________ f. What’s the x-intercept of the quadratic function: 2 ( ) 2 12 10 m x x x = - + - A. 2, 3 B. 0, -10 C. –10, 0 D. 1, 5 _________ g. Which of the following expression gives the value 4 .

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