EDGC 671 Theory Review Dean Owen, Ph.D., LPCC Rational Emotive Behavior Therapy.
Rational Review
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Transcript of Rational Review
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NO HOMEWORK QUIZ
• TURN IN WORK!!!!!!
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Rational Review
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As X approaches infinity
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As X approaches infinity
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Asymptotes and Discontinuity
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Asymptotes and Discontinuity
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Asymptotes and Discontinuity
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Asymptotes and Discontinuity
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Asymptotes and Discontinuity
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Asymptotes and Discontinuity
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Domain and Range
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Translation
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Inequality
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Most tunnels are drilled using tunnel-boring machines that begin at both ends of the tunnel. Suppose a new underwater tunnel is being built and one tunnel-boring machine alone can finish the tunnel in 4 years. A different type of machine can tunnel to the other side in 3 years. If both machines start at opposite ends and work at the same time, when will the tunnel be finished?
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Let x = number of years together
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Let x = number of years together
Equation:
1 job 1 job 1 job
4 years 3 years x together
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Let x = number of years together
Equation:
1 job 1 job 1 job
4 years 3 years x together
1 1 1
4 3 x
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Solve equation: multiply by common denominator (4)(3)(x).
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Solve equation: multiply by common denominator (4)(3)(x).
1(3 ) 1(4 ) 1(4)(3)x x
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Solve equation: multiply by common denominator (4)(3)(x).
1(3 ) 1(4 ) 1(4)(3)x x
3 4 12x x
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Solve equation: multiply by common denominator (4)(3)(x).
7 12x
1(3 ) 1(4 ) 1(4)(3)x x
3 4 12x x
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Solve equation: multiply by common denominator (4)(3)(x).
12 5 or 1 years
7 7x
7 12x
1(3 ) 1(4 ) 1(4)(3)x x
3 4 12x x
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If both machines work toward each other it will take 1.7 years to finish the tunnel.
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If both machines work toward each other it will take 1.7 years to finish the tunnel.
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A car travels 300 km in the same time that a freight train travels 200 km. The speed of the car is 20 km/hr more than the speed of the train. Find the speed of the car and the speed of the train.
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A car travels 300 km in the same time that a freight train travels 200 km. The speed of the car is 20 km/hr more than the speed of the train. Find the speed of the car and the speed of the train.
Let x = speed of train
Let x + 20 = speed of car
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A car travels 300 km in the same time that a freight train travels 200 km. The speed of the car is 20 km/hr more than the speed of the train. Find the speed of the car and the speed of the train.
Let x = speed of train
Let x + 20 = speed of car
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Use the formula d = rt. Solve for “t”.
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t = d/r
Use the formula d = rt. Solve for “t”.
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t = d/r
car traint t
Use the formula d = rt. Solve for “t”.
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t = d/r
car traint t
car train
car train
d d
r r
Use the formula d = rt. Solve for “t”.
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t = d/r
car traint t
car train
car train
d d
r r
300 200
x 20 x
Use the formula d = rt. Solve for “t”.
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Solve: multiply by the common denominator (x + 20)(x).
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Solve: multiply by the common denominator (x + 20)(x).
300 200( 20)x x
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Solve: multiply by the common denominator (x + 20)(x).
300 200 4000x x
300 200( 20)x x
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Solve: multiply by the common denominator (x + 20)(x).
300 200 4000x x
100 4000x
300 200( 20)x x
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Solve: multiply by the common denominator (x + 20)(x).
300 200 4000x x
100 4000x
40x
300 200( 20)x x
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Speed of train = x = 40 km/hr
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Speed of train = x = 40 km/hr
Speed of car = x + 20 = 60 km/hr
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Speed of train = x = 40 km/hr
Speed of car = x + 20 = 60 km/hr
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A boat travels 20 miles upstream(means against the current) with a current going 4 miles/hour. The boat makes the trip THERE AND BACK in 5 hours. What is the SPEED OF THE BOAT?
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A boat travels 20 miles upstream(means against the current) with a current going 4 miles/hour. The boat makes the trip THERE AND BACK in 5 hours. What is the SPEED OF THE BOAT?
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