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When you excersise, your target heart rate should be between 25% to 70% of your maximum heart rate. 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.</span>
<span>D.) glockenspiel This is because of the different pitches that follow along with any not of the instrument. Each part has a different pitch, therefore, is not definite. </span>