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40 th Annual Lee Webb Math Field Day March 12, 2011

Join us for the 40th Annual Lee Webb Math Field Day Varsity Math Bowl featuring challenging math problems and teamwork. Get ready to engage with brain-teasing questions and showcase your mathematical skills.

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40 th Annual Lee Webb Math Field Day March 12, 2011

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  1. 40th Annual Lee Webb Math Field DayMarch 12, 2011 Varsity Math Bowl

  2. Before We Begin: • Please turn all cell phones off, or set to vibrate, while the Math Bowl is in progress. • Students will use the TI-Inspire only to electronically submit their answers. You will not be able to use the calculator to perform any computations. • Turn on your calculator by pressing the ON button in the lower left corner. The HOME screen should appear, and A: Calculate should be highlighted.

  3. For each question, a signal will be sent to your calculator, and a screen will appear for your use in submitting your answers. • You will need to use the TAB button, located on the upper left side of calculator, to the left of the large round thumb cursor to submit your answers. • We will first make sure that all calculators are properly logged in before we start.

  4. We will do a sample question each round, utilizing some keys that students may need for their answers. • There is to be no talking among the students on stage once the round has begun. • Audience please do not shout out any answers.

  5. 2011 Math BowlVarsityRound 1

  6. Sample - 45 seconds Submit the following answer, being sure to place parentheses properly to dictate the desired order of operations. Remember to use the tab key to exit an exponent.

  7. Problem 1.1 - 30 seconds Find the image of the point P(a, b) under the following transformation: A reflection in the line y = x, followed by a reflection across the x axis. Write your answer as an ordered pair.

  8. Problem 1.2 - 45 seconds • The sum of three numbers is 48. The first number is three times as big as the last number, while the second number is 8 more than the last number. Find the value of the three numbers, and write them in increasing order.

  9. Problem 1.3 - 60 seconds Find all real values of x that satisfy the equation.

  10. Problem 1.4 - 30 seconds • Simplify as much as possible.

  11. Problem 1.5 - 30 seconds • Simplify the complex fraction.

  12. Problem 1.6 - 45 seconds Find the center point of this circle. Write your answer as an ordered pair. x2– 10x + y2 + 6y + 34 = 25

  13. Problem 1.7 - 60 seconds It takes Ramon 10 hours to paint a garage. If his friend Mike helps, they can get the job done in six hours. How many hours would it take Mike to paint the garage by himself?

  14. Problem 1.8 - 30 seconds If f(x) = then f -1(x) = ?

  15. Problem 1.9 - 30 seconds Assume that each branch point in the maze below is equally likely to be chosen. Determine the probability that a person entering the maze will end up in room A.

  16. Problem 1.10 - 45 seconds If log2x + log2(x - 4) = 5, then x = ?

  17. Problem 1.11 - 45 seconds If the fifth number in a geometric sequence is 625, and the sixth number is 3125, what is the first number in the sequence?

  18. Problem 1.12 - 30 seconds

  19. 2011 Math BowlVarsityRound 2

  20. For each question, a signal will be sent to your calculator, and a screen will appear for your use in submitting your answers. • You will need to use the TAB button, located on the upper left side of calculator, to the left of the large round thumb cursor to submit your answers. • We will first make sure that all calculators are still properly logged in before we start. • Next we will review the keyboard again.

  21. Sample - 45 seconds Submit the following answer, being sure to place parentheses properly to dictate the desired order of operations. Remember to use the tab key to exit an exponent.

  22. Problem 2.1 - 15 seconds The heights of 100 girls at a local high school were measured, and the mean was found to be 64 inches, with a standard deviation of 2 inches. Assume the heights are normally distributed. How many of the girls are between 60” and 68” tall?

  23. Problem 2.2 - 30 seconds A basketball is thrown straight up into the air. The equation giving the height h of the ball above the ground as a function of the time t in seconds after the ball was thrown is h(t) = -16t2 + 48t + 5. What is the maximum height in feet that the ball reaches?

  24. Problem 2.3 - 30 seconds Find the limit.

  25. Problem 2.4 - 30 seconds Assume that the cost of CSUB tuition continues to increase annually at a rate of 10% per year. If tuition costs $5000 in your first year, what will be the cost in dollars of tuition in your fourth year?

  26. Problem 2.5 - 15 seconds Simplify:

  27. Problem 2.6 - 45 seconds Solve the inequality. (2t +6)(t - 2) < 0 Give your answer in interval notation.

  28. Problem 2.7 - 45 seconds Find the degree measure of angle x. (Drawing not to scale.)

  29. Problem 2.8 - 30 seconds The chess club has 10 members. In how many different ways can they select a President, Vice-President and Secretary?

  30. Problem 2.9 - 30 seconds Solve for x. log2(log16(x)) = -2

  31. Problem 2.10 - 15 seconds If xi = 2i + 5, find:

  32. Problem 2.11 - 30 seconds Find the length of x in the drawing. (Not to scale.)

  33. Problem 2.12 - 15 seconds Find cos

  34. 2011 Math BowlVarsityRound 3

  35. For each question, a signal will be sent to your calculator, and a screen will appear for your use in submitting your answers. • You will need to use the TAB button, located on the upper left side of calculator, to the left of the large round thumb cursor to submit your answers. • We will first make sure that all students have the correct calculator and that the calculators are properly logged in before we start. • Next we will review the keyboard again.

  36. Sample - 45 seconds Submit the following answer, being sure to place parentheses properly to dictate the desired order of operations. Remember to use the tab key to exit an exponent.

  37. Problem 3.1 - 30 seconds Let f(x) = 7x + 2. Find:

  38. Problem 3.2 - 15 seconds

  39. Problem 3.3 - 30 seconds Calculate the sum of the base four numerals. Write your answer in base four. 321 + 123

  40. Problem 3.4 - 45 seconds Points A and C are on the circle centered at O, and AB is tangent to the circle. Given that OA and AC both have length 5, find the length of AB in the figure below. Express your answer in radical form.

  41. Problem 3.5 - 30 seconds

  42. Problem 3.6 -30 seconds Given log2x + log2y = log2z. Solve for y in terms of x and z.

  43. Problem 3.7 - 45 seconds Solve for x. 2ex + 3e -x =

  44. Problem 3.8 - 15 seconds If g(x) = x3, and h(g(x)) = x9 + 3, give the expression for h(x).

  45. Problem 3.9 - 30 seconds Let C equal the matrix product AB, where A & B are given below. What is the value of C12?

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