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anonymous

  • 5 years ago

An airplane flew for 8 hours at an airspeed of x miles per hour (mph), and for 7 more hours at 325 mph. If the average airspeed for the entire flight was 350 mph, which of the following equations could be used to find x ? A. x + 325 = 2(350) B. x + 7(325) = 15(350) C. 8 x – 7(325) = 350 D. 8 x + 7(325) = 2(350) E 8 x + 7(325) = 15(350)

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  1. anonymous
    • 5 years ago
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    e is the asnwer

  2. anonymous
    • 5 years ago
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    8hour at speed of x so its 8x and 7 more means add 7 so + 7 at 325mph so its 7(325) entire flight gives ou clue that its equal to entire flight is 15 hours 8+7 and its average speed is 350 so 15(350) which gives you 8x + 7(325) = 15(350)

  3. anonymous
    • 5 years ago
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    Doctors use the term maximum heart rate (MHR) when referring to the quantity found by starting with 220 beats per minute and subtracting 1 beat per minute for each year of a person’s age. Doctors recommend exercising 3 or 4 times each week for at least 20 minutes with your heart rate increased from its resting heart rate (RHR) to its training heart rate (THR), where THR = RHR + .65(MHR – RHR) Which of the following is closest to the THR of a 43-year-old person whose RHR is 54 beats per minute? A. 197 B. 169 C. 162 D. 134 E. 80

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