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The recommended heart rate for exercise, in beats per minute, depends on a person's age and can be represented by the expression 0.7 (220 - a). What does the variable a represent in the expression? a.The average heart rate b.The total heart beats per minute c.The age of a person d. The number of minutes a person exercises

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The recommended heart rate for exercise, in beats per minute, depends on a person's age and can be represented by the expression 0.7 (220 - a). What does the variable a represent in the expression? a.The average heart rate b.The total heart beats per minute c.The age of a person d. The number of minutes a person exercises​

Part 1

The variale a represent a person's age

option C

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