document.write( "Question 1137893: 1. George has $700 to invest. Suppose he invests $300 at 6% interest. At what rate must he invest the other $400 so that the two investments yield more than $70 of yearly interest?\r
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\n" ); document.write( "\n" ); document.write( "2. Angie bought some golf balls for $5. If each ball had cost $0.25 less, she could have purchased one more ball for the same amount of money. How many balls did Angie buy?
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Algebra.Com's Answer #755898 by MathTherapy(10552) $\"\"$ $\"About$

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1. George has $700 to invest. Suppose he invests $300 at 6% interest. At what rate must he invest the other $400 so that the two investments yield more than $70 of yearly interest?\r
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1.
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document.write( "Let rate be r
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document.write( "The we get: .06(300) + r(400) > 70
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document.write( "18 + 400r > 70
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document.write( "400r > 52
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document.write( "Rate, or 
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document.write( "2.
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document.write( "Let number she bought be G
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document.write( "Cost of each ball: 
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document.write( "Had each cost 25c less, then each would be 
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document.write( "We then get: 
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document.write( " ------ FOILing binomials on left side
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document.write( " ------- Multiplying by LCD, G
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document.write( " ------- Multiplying by - 4 to clear DECIMALS
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document.write( "(G - 4)(G + 5) = 0 --- Factoring TRINOMIAL on left side
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document.write( "Number of golf balls purchased, or        OR        G = - 5 (ignore) \n" );
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