Exam 6: Rational Expression and Equations

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A plane can fly 260 miles in the same time as it takes a car to go 100 miles. If the car travels 80 mph slower than the plane, find the speed of the plane.

(Short Answer)
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Divide using long division: 9x3+3x2+6x63x2\frac { 9 x ^ { 3 } + 3 x ^ { 2 } + 6 x - 6 } { 3 x - 2 }

(Multiple Choice)
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Perform the indicated operation. Simplify, if possible. 6x2+7x107x2+8x127x2+x636x225\frac { 6 x ^ { 2 } + 7 x - 10 } { 7 x ^ { 2 } + 8 x - 12 } \cdot \frac { 7 x ^ { 2 } + x - 6 } { 36 x ^ { 2 } - 25 }

(Multiple Choice)
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Perform the operations and simplify the result when possible. 6xx+1+2x+14xx+1\frac { 6 x } { x + 1 } + \frac { 2 } { x + 1 } - \frac { 4 x } { x + 1 }

(Short Answer)
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A boat can cruise at 35 mph in still water. What is its cruising speed upstream against a current of 5 mph? ______ mph

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Multiply, then simplify if possible. x2xx3x933x\frac { x ^ { 2 } - x } { x } \cdot \frac { 3 x - 9 } { 3 - 3 x }

(Essay)
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Solve the proportion. r25=r7\frac { r - 2 } { 5 } = \frac { r } { 7 }

(Short Answer)
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Solve the problem by writing a variation model. Under constant temperature, the volume occupied by a gas varies inversely to the pressure applied. If the gas occupies a volume of 18 cubic inches under a pressure of 5 pounds per square inch, find the volume when the gas is subjected to a pressure of 10 pounds per square inch. __________ in3

(Short Answer)
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Perform the division. (3y12+15y2)÷(5y4)\left( 3 y - 12 + 15 y ^ { 2 } \right) \div ( 5 y - 4 )

(Multiple Choice)
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Use the factor theorem and determine whether the first expression is a factor of P ( x ). x4;P(x)=x34x2+3x10x - 4 ; P ( x ) = x ^ { 3 } - 4 x ^ { 2 } + 3 x - 10

(Essay)
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Use synthetic division to perform the division. (2x213x+15)÷(x5)\left( 2 x ^ { 2 } - 13 x + 15 \right) \div ( x - 5 )

(Multiple Choice)
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Subtract, and then simplify, if possible. 10a+414a+3\frac { 10 } { a + 4 } - \frac { 14 } { a + 3 }

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Perform the division. 6x2x49x\frac { 6 x ^ { 2 } - x ^ { 4 } } { - 9 x }

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Perform the division. 4x2x314x\frac { 4 x ^ { 2 } - x ^ { 3 } } { - 14 x }

(Multiple Choice)
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Express the verbal model in symbols. C varies directly as the square of p .

(Multiple Choice)
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Perform the indicated operation. Simplify, if possible. x3x4+x6x+1\frac { x - 3 } { x - 4 } + \frac { x - 6 } { x + 1 }

(Multiple Choice)
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If it takes a teacher 3 hours to fill out report cards, what part of the job does she accomplish in x hours?

(Essay)
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Use synthetic division to perform the division. 2x31229xx4\frac { 2 x ^ { 3 } - 12 - 29 x } { x - 4 }

(Multiple Choice)
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Use the factor theorem and determine whether the first expression is a factor of P ( x ). x+1;P(x)=4x2+6x+2x + 1 ; P ( x ) = 4 x ^ { 2 } + 6 x + 2 ( Hint : Write x+1x + 1 as x(1)x - ( - 1 ) .)

(Essay)
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Solve the proportion. 2c=c46\frac { 2 } { c } = \frac { c - 4 } { 6 }

(Multiple Choice)
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