What is the target heart rate Mrs. Adams should achieve if she wants to exercise at 60% or greater of her maximum heart rate? She is 52 years old.

To determine Mrs. Adams' target heart rate for exercising at 60% or greater of her maximum heart rate, we start by calculating her maximum heart rate using the formula: 220 minus her age.

For a 52-year-old, the calculation would be: 220 - 52 = 168 bpm (beats per minute).

Next, to find 60% of the maximum heart rate: 0.60 x 168 = 100.8 bpm.

Since we typically round to the nearest whole number when determining target heart rates, this value rounds to approximately 101 bpm. However, in this context, it's important to understand that the target heart rate should be a value that is practical for effective exercise. Exercising at or above 60% of the maximum heart rate is generally considered effective for improving cardiovascular fitness.

Considering the options available, the choice that most closely corresponds to this calculation is 100 bpm. This target heart rate is appropriate for Mrs. Adams as it is at the threshold of 60% of her maximum heart rate, thus ensuring she is exercising at a sufficient intensity for health benefits.