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Flashback 9-24-12

Flashback 9-24-12. A neighborhood recreation program serves a total of 280 children who are either 11 years old or 12 years old. The sum of the children’s ages is 3,238 years. How many 11-year-old children does the recreation program serve?

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Flashback 9-24-12

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  1. Flashback 9-24-12 • A neighborhood recreation program serves a total of 280 children who are either 11 years old or 12 years old. The sum of the children’s ages is 3,238 years. How many 11-year-old children does the recreation program serve? A.55 B.122 C.132 D.158 E. 208 • The geometric figure shown below consists of a square and 4 semicircles. The diameters of the semicircles are the sides of the square, and each diameter is 10 centimeters long. Which of the following is the closest approximation of the total area, in square centimeters, of this geometric figure? F.100 G.160 H. 260 J.400K. 730

  2. Joke of the day I met a math professor who has 12 children

  3. - she really knows how to multiply.

  4. Transforming trig functions • Sine function or Sinusoid: • F(x) = A sin [ 2∏/B (x – C)] + D • A = amplitude or vertical stretch or shrink • B = period or horizontal stretch or shrink • C = horizontal shift • D = vertical shift

  5. Example • Y= 3 cos (2x - ∏) + 1 • Re-write as y = 3 cos [ 2(x - ∏/2)] + 1 • Period: 2 ∏/B = 2 so B = ∏ • Domain: (- ∞,∞) • Range: [ -2,4] because the graph has been stretched by factor of 3 (normal cosine range [-1,1]) and shifted UP 1 unit.

  6. Class/homework • P. 52 Ex 1-4, 11-14

  7. Exit Slip • True or false: The period of y = sin(x/2) is ∏. Justify your answer.

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