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anonymous

  • one year ago

Bruce had an EKG to measure his heartbeat rate. After conversion, the function produced could be modeled by a cosine function, and the wave produced a maximum of 4, minimum of −2, and period of pi over 2. Which of the following functions could represent Bruce's EKG read-out?

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  1. anonymous
    • one year ago
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    f(x) = 4 cos pi over 2x − 2 f(x) = 3 cos 4x + 1 f(x) = 3 cos pi over 2x + 1 f(x) = 4 cos 4x − 2

  2. anonymous
    • one year ago
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    f(x) = A cos (Bx + C) + D A = amplitude = ½|max - min| B = (2π)/period C = phase shift = 0 for this problem D = vertical shift = max - amplitude

  3. anonymous
    • one year ago
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    A and D are wrong right?

  4. anonymous
    • one year ago
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    yes

  5. anonymous
    • one year ago
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    i think its C

  6. anonymous
    • one year ago
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    The coefficient of x is 2pi/period, so it should be \[2 \pi \div \frac{ \pi }{ 2 }\]

  7. anonymous
    • one year ago
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    oh so its 4

  8. anonymous
    • one year ago
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    so 4x

  9. anonymous
    • one year ago
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    yep

  10. anonymous
    • one year ago
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    i see now its B thank you very much

  11. anonymous
    • one year ago
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    you're welcome

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