MATH 121 - WRITTEN EXERCISES-MODULE 2

MATH 121 - WRITTEN EXERCISES-MODULE 2 - Jimmy...

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Jimmy Morgan-MAT-121-OL-(1 Nov 09 thru 23 Jan 2010) Module 2 - Written Assignment 2 1.1 12.) ( 29 ( 29 4 -2 1 6 2 4 ; 8 4 6 2 4 x x x x + = - - - + = - + 8 4 10 2 x x - + = - 8 4 2 10 2 2 x x x x - + + = - + 6 4 - 4 10 4 x - + = - 6 6 6 6 x - = - - { } 1 x = - 20.) ( 29 ( 29 ( 29 ( 29 2 5 2 ; 2 5 9 2 15 15 9 x x x x + + = + = +   18 45 15 30;18 15 30 45 x x x x x + = + - = -   { } 3 15 3 15; ; 5 3 3 x x x - = - = = -     40.) I = Prt, for P (simple interest) Pr ; I t I I P or P rt rt rt rt = = = 44.) ( 29 1 , ( ) 2 A h B b for h area of a trapezoid = + ( 29 1 2 A B b h + + = 2 2 A A h or h B b B b = = + +       60.) Simple Interest. Jennifer Johnston borrows $20,900 from her bank to open a florist shop. She agrees to repay the money in 18 months with simple annual interest of 10.4%. a. How much must she pay the bank in 18 months. b. How much of the amount in part a is interest? r = 10.4%; P = $20,900; t = 18 12 I= Prt = 20,900(.104) 18 12 = $3260.40 (answer to question “b”) $20,900 + $3260.40 = $24,160.40 (answer to question “a”) 64.) 86° . Convert F to other system ( 29 ( 29 5 5 32 ; 86 32 9 9 C F C = - = - ( 29 5 54 ; 30°C 9 C C = =
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Jimmy Morgan-MAT-121-OL-(1 Nov 09 thru 23 Jan 2010) Module 2 - Written Assignment 2 1.2 2.) If 120 L of an acid solution is 75% acid, how much pure acid is there in the mixture? 120 x .75 = 90 L 14.) World’s Largest Ice Cream Cake. Carvel Corporation, the nation’s first retail ice cream franchise, built the world’s largest ice cream cake in Union Square on May 26, 2004. Weighing 12,096 lb, the cake too 75 min and 54 people to build and assemble. The cake’s length was 10 ft longer than its width, and its perimeter was 56 ft. What were the width and the length of the cake, in feet? Length = (x+10) P = l + w P = 2w + 2l 56 = x + x + 2(x + 10) 56 = 2x + 2x + 20 56 = 4x + 20; 56-20 = 4x 36 = 4x 9 = x or x = 9 (length is 10 ft longer than the width) 9 + 10 = 19 (length = 19; width = 9) 18.) Concept Check. Which on of the following cannot be a correct equation to solve a geometry problem, if x represents the length of a rectangle? Answer is “B” and “C”. A. ( 29 2 2 1 14; 4 -2=14 x x + - =    x 4 2 2 14 2 x - + = + 4 16; 4 x x = =    B. ( 29 2 7 5 52; 9 35 52 x x x - + - = - + =    9 35 35 52 35 x - + - = - 17 9 17; 9 x x - = =    C. ( 29 5 2 5 10; 10 10 10 x x x + + = + =    10 10 10 10 10 x + - = - 0 x = D. ( 29 2 2 3 22; 4 6 22 x x x + - = - =    4 6 6 22 6 x - + = + 4 28; 7 x x = =    Width = x
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Jimmy Morgan-MAT-121-OL-(1 Nov 09 thru 23 Jan 2010) 1.2 (Con’t) 20.) Distance between cities. On a vacation, Elwyn averaged 50 mph traveling from Denver to Minneapolis. Returning by a different route that covered the same number of miles, he averaged 55 mph. What is the distance between the two cities if his total traveling time was 32 hr? Going (50 mph)
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This note was uploaded on 04/07/2012 for the course MATH 121 taught by Professor Crockett during the Spring '12 term at Thomas Edison State.

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MATH 121 - WRITTEN EXERCISES-MODULE 2 - Jimmy...

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