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152E2-F09 - MA 15200 1 Exam 2A Fall 2009 Dried fruit sells...

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MA 15200 Exam 2A Fall 2009 1 1) Dried fruit sells for $2.95 a pound. Mixed nuts sell for $3.50 a pound. How many pounds of both should be mixed to result in 20 pounds of a mix that sells for $2.20 a pound? Select an equation that could be used to solve this problem. Let x = the number of pounds of dried fruit . 2.95 3.5(20) 2.2( 20) 2.95 3.5 2.2(2 ) 2.95 3.5(20 ) 2.2(20) 2.95 3.5(20 ) 2.20 2.95 3.5( 20) 2.2(20) A x x B x x x C x x D x x E x x + = + + = + - = + - = + - = 2) In electronics, the formula V IR = is called Ohm’s law, where V is the voltage (in volts), I is the current (in amperes), and R is the resistance (in ohms). Find the number of volts when there are 6 3 i - amperes and 16 3 i + ohms. 87 30 volts 105 30 volts 96 39 volts 99 30 volts 105 30 volts A i B i C i D i E i - + - - - 3) After completing the square, the equation 2 30 12 0 x x - + = becomes which of the following? 2 2 2 2 2 ( 15) 225 ( 30) 888 ( 15) 12 ( 15) 213 ( 30) 213 A x B x C x D x E x - = - = - = - = - =
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MA 15200 Exam 2A Fall 2009 2 4) Solve and simplify solutions: 2 3 2 2 x x + = 10 1 2 1 10 2 4 10 2 1 2 10 2 1 2 A x B x C x D x E x i = ± ± = ± = = ± = ± 5) Two hoses working together can fill a tank in 4 hours. The larger hose, working
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