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Question

Doctors Use the Term Maximum Heart Rate (Mhr) When Referring to the Quantity Found by Starting with 220 Beats per Minute and Subtract 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 Resting Heart Rate ( Rhr) to its Training Heart Rate Where Thr = Rhr + 65(Mhr - Rhr)
what is the thr of a 43 yearold person whose Rhr is 54 beats per minutes?

An airplane flew for 8 hrs at at an airspeed of x miles per hour (mph), and for 7 more hrs at 325 mph. if the average airspeed for the flight was 350 mph, which of the following equations could be used to find X?

Answer 1

Something's wrong with the writeup for the first question. I'm guessing it should have said THR = RHR + 0.65(MHR-RHR), because otherwise you're gonna get a THR of, like, 10000 beats per minute.

Proceeding from that assumption, the THR is RHR + 0.65(MHR-RHR). You're told that the RHR is 54 bpm. The MHR is 220 - the age(43), so it's 177. Therefore the THR is 54 + 0.65(177-54) = 54 + 0.65(123) = 54 + 79.95 = 133.95 bpm.

In the second question, you didn't provide the "following equations," but think of it this way. The airplane flew for a total of 15 hours at an average speed of 350 miles per hour. That means it went 5250 miles. In the final 7 hours it went 2275 miles. So in the first 8 hours it had to go 2975 miles. 2975 miles/8 hours = 371.875 mph. I don't exactly know how to write that in an equation, but now that you understand the reasoning, hopefully you'll be able to recognize the correct equation. If all else fails, plug the data into each equation and see which one returns 371.875.

Answer 2

Thr = 54 + 65 [(220-43) - 54]
For a grand total of 8049

No way someone can hit that high of a number. Are you certain that's the right equation?