alabama statewide math contest - round 4 division 2...alabama statewide math contest - round 4...
TRANSCRIPT
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Alabama Statewide Math Contest - Round 4Division 2
University of Alabama at Birmingham
April 6, 2019
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2
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Scoring
Scoring0:00 - 0:30 10 points0:31 - 1:00 8 points1:01 - 1:30 6 points1:31 - 2:00 4 points
If the first person to answer is correct, they receive2 Bonus Points.
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2
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Rules
Rules1. Answers must be in answer box provided to be counted. Units
such as cm, in, etc. are not necessary.
2. Fractions must be reduced. Improper fractions are acceptable.
3. The numbers π and e must be left as such.
4. Complex numbers must be put into a + bi form.
5. Answers with radicals must be simplified. Denominators mustbe rationalized.
6. Exponents should be positive.
7. Answers involving trigonometric functions should be simplifiedas much as possible.
8. log(x) means log10(x) and ln(x) means loge(x).
9. The time limit for all problems is 2 minutes.
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2
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Rules
Rules
1. Answers must be in answer box provided to be counted. Unitssuch as cm, in, etc. are not necessary.
2. Fractions must be reduced. Improper fractions are acceptable.
3. The numbers π and e must be left as such.
4. Complex numbers must be put into a + bi form.
5. Answers with radicals must be simplified. Denominators mustbe rationalized.
6. Exponents should be positive.
7. Answers involving trigonometric functions should be simplifiedas much as possible.
8. log(x) means log10(x) and ln(x) means loge(x).
9. The time limit for all problems is 2 minutes.
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2
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Sample Problem # 1
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Sample Problem
RESET :
Solve for x in the equation
x2 − 6x − 3 = 0
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Sample Problem
Answer:
3 + 2√3,and 3− 2
√3.
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Sample Problem
Answer: 3 + 2√3,and 3− 2
√3.
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2
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Round 4
Geometry
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Geometry Question # 1
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Geometry Question # 1
RESET :In the figure below, AC = 10, CD = 8, and ∠CAD ∼= ∠ABC . Findthe length of BD.
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Geometry Question # 1
Answer:
4.5
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Geometry Question # 1
Answer: 4.5
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Geometry Question # 2
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Geometry Question # 2
RESET :In the figure below, points A, B, D, E , and F are on the circle,←→BC is tangent to the circle at B with BC = 5, CF is a secant line,and AE and DF are chords intersecting at G with AG = 8,FG = 4 and GE = 3. Find CD.
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Geometry Question # 2
Answer:
5√2− 5
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Geometry Question # 2
Answer: 5√2− 5
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Round 4
Algebra II & Trig
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Algebra II & Trig Question # 3
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Algebra II & Trig Question # 3
RESET :Let f −1(x) =
x3 − 3
5x2 + 1. Find the y -intercept of the function f (x).
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Algebra II & Trig Question # 3
Answer:
3√3
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Algebra II & Trig Question # 3
Answer: 3√3
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Algebra II & Trig Question # 4
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Algebra II & Trig Question # 4
RESET :How many zeros are at the end of 43! ?
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Algebra II & Trig Question # 4
Answer:
9
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Algebra II & Trig Question # 4
Answer: 9
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2
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Round 4
Comprehensive Part 1
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Comprehensive Part 1Question # 5
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Comprehensive Part 1 Question # 5
RESET :The surface area of a sphere is 16π. What is the height of theshortest cylinder in which the sphere could be contained?
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Comprehensive Part 1 Question # 5
Answer:
4
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2
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Comprehensive Part 1 Question # 5
Answer: 4
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Comprehensive Part 1Question # 6
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Comprehensive Part 1 Question # 6
RESET :Find the value of log√2 32.
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Comprehensive Part 1 Question # 6
Answer:
10
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Comprehensive Part 1 Question # 6
Answer: 10
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Round 4
Comprehensive Part 2
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Comprehensive Part 2Question # 7
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Comprehensive Part 2 Question # 7
RESET :If 3−
√5 is one root of the quadratic function f (x) = x2 + bx + c ,
where b and c are integers, find b + c .
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Comprehensive Part 2 Question # 7
Answer:
−2
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Comprehensive Part 2 Question # 7
Answer: −2
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Comprehensive Part 2Question # 8
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Comprehensive Part 2 Question # 8
RESET :Find the value of
712 − 292
552 − 452.
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Comprehensive Part 2 Question # 8
Answer:
4.2
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Comprehensive Part 2 Question # 8
Answer: 4.2
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Round 4
Team
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Team Question # 9
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Team Question # 9
RESET :How many distinct arrangements are there of the lettersSTATEMATH? You should provide your answer as an integer.
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Team Question # 9
Answer:
30,240
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Team Question # 9
Answer: 30,240
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Team Question # 10
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Team Question # 10
RESET :If x − 1
x= 2√
3, find the value of
(x2 − 1
x2
)2
.
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Team Question # 10
Answer:
192
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Team Question # 10
Answer: 192
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End of Round 4
University of Alabama at Birmingham Alabama Statewide Math Contest - Round 4 Division 2