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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)
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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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.08hour 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)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Doctors 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 43yearold person whose RHR is 54 beats per minute? A. 197 B. 169 C. 162 D. 134 E. 80
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