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When you exercise, your target heart rate r at 70% can be determined by the formula r = 0.7(220 − a) where a represents your age in years. Solve the formula for a. PLEASE HELP
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When you exercise, your target heart rate r at 70% can be determined by the formula r = 0.7(220 − a) where a represents your age in years. Solve the formula for a.

PLEASE HELP

User Monocle
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don’t use those links they’re scams
User Mayank Ahuja
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