Alabama Statewide Math Contest - Round 3 Division II · 2020. 4. 16. · Alabama Statewide Math...

GeometryAlgebra II & Trig

Comprehensive Part 1Comprehensive Part 2

Alabama Statewide Math Contest - Round 3Division II

University of Alabama at Birmingham

April 14, 2018

University of Alabama at Birmingham Alabama Statewide Math Contest - Round 3 Division II

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.

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.

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.

Sample Problem # 1

Sample Problem

RESET :

Solve for x in the equation

x2 − 6x− 3 = 0

Sample Problem

Answer:

3 + 2√3, and 3− 2

Sample Problem

Answer: 3 + 2√3, and 3− 2

Question # 1Question # 2

Round 3

Geometry

Geometry Question # 1

RESET :A rhombus has sides of length 10, and its diagonals differ by 4.What is its area?

Answer:

Answer: 96

RESET :In the figure below, AB = 6, m(∠ABC) = 75◦ andm(∠ACB) = 45◦. Find the length of side BC.

Answer:

Answer: 3√6

Round 3

Algebra II & Trig

Algebra II & Trig Question # 3

RESET :Find the median of the solution set to

2x3 − 5x2 − 4x+ 3 = 0

Answer:

Answer:1

RESET :Find the x-intercept of the line which passes through the point(1, 2) and is perpendicular to the line 3x+ 2y = 5.

Answer:

Answer: −2

Round 3

Comprehensive Part 1

Comprehensive Part 1Question # 5

Comprehensive Part 1 Question # 5

RESET :A class has an average of 8.5 on a quiz. One more person takes it,receives a 7, and the average drops to 8.25. How many peopleoriginally took the quiz?

Answer:

Answer: 5

RESET :The product of the roots of a quadratic function is −4 and their

sum is −15

2. Find the absolute value of the difference of the roots.

Answer:

Answer:17

Round 3

Comprehensive Part 2

RESET :If logb(x) = 2, find logb

Answer:

Answer: −10

RESET :A fair coin is flipped five times. What is the probability that itshows exactly three heads?

Answer:

Answer:5

Round 3

Team Question # 9

RESET :In a certain basketball-type game, the only ways to score points arewith a three point basket or a five point basket. What is thelargest score that is not attainable?

Team Question # 9

Answer:

Team Question # 9

Answer: 7

Team Question # 10

RESET :The function f(x) = x3 − 8 has three unique roots. Find the areaof the triangle formed by these three roots in the complex plane.

Team Question # 10

Answer:

Team Question # 10

Answer: 3√3

End of Round 3

Alabama Statewide Math Contest - Round 3 Division II · 2020. 4. 16. · Alabama Statewide Math...

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