It 100% A and C, good luck
Maximum heart rate is the maximum heart rate (the number of times your heart beats per minute (bpm)) that an individual can attain that is based on his/her genetics. The most common calculation for the maximum heart rate is: 220-Age
In Paul's case, Age=17, so his maximum heart rate is 220-17=203 bpm.
Answer:
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D. A consumer buys or trades to receive a commodity available for sale or exchange
By slowly introducing the changes and not implementing them all at once.