Answer:
Step-by-step explanation: you find your maximum heart beat by keeping tract of it for 10 seconds and then •6 to find 50 percent you would • by .5 to find 70 percent you would • by .7
XYsq = 9sq - 6sq
XY = √45 = 6.7 units
cosZ = 6/9 = .666
Z = 48.25°
sinY = 6/9 = .666
Y = 41.75°
hope it helps :D
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Step-by-step explanation: