In order to achieve maximum results from aerobic exercise, one’s heart rate at a certain level. a 35-yr-old woman with a resting heart rate of 80 beats per minute should keep her heart rate between 143 and 164 beats per minute while exercising. she check her pulse for 10 sec while exercising. what should the number of beats be ?

2160ft3

step-by-step explanation:

an = 22 + (n-1) *6

110 seats

step-by-step explanation:

an=a1+(n-1)(d)

a1 = 22   this is the first item in the sequence

d =6   this is how the sequence goes up

a)   an = 22 + (n-1) *6

b) a12 = 22 + (12-1) *6

    a12 = 22+11*6

  a12 = 22 +88

  a12 = 110

x=25tan30=14.43 or the answer is b

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