John runs at different speeds as part of his training program. The graph shows his target heart rate

Q: What is the correct answer for SAT Maths?

The correct answer is D. Let's analyze each interval: A) Between 0 and 30 minutes: The heart rate decreases from 0-10 min, then increases from 10-30 min. This is not strictly increasing then strictly decreasing. B) Between 40 and 60 minutes: The heart rate increases from 40-50 min, then decreases from 50-60 min. This fits the description. C) Between 50 and 65 minutes: The heart rate increases from 50-60 min, then decrease

Q: John runs at different speeds as part of his training program. The graph shows his target heart rate at different times during his workout. The x-axis represents Time (minutes) from 0 to 100, and the…

The correct answer is D. Let's analyze each interval: A) Between 0 and 30 minutes: The heart rate decreases from 0-10 min, then increases from 10-30 min. This is not strictly increasing then strictly decreasing. B) Between 40 and 60 minutes: The heart rate increases from 40-50 min, then decreases from 50-60 min. This fits the description. C) Between 50 and 65 minutes: The heart rate increases from 50-60 min, then decrease

Q: What are the options for this SAT Maths question?

A. Between 0 and 30 minutes · B. Between 40 and 60 minutes · C. Between 50 and 65 minutes · D. Between 70 and 90 minutes

Question

John runs at different speeds as part of his training program. The graph shows his target heart rate at different times during his workout. The x-axis represents Time (minutes) from 0 to 100, and the y-axis represents Target heart rate (beats per minute) from 40 to 160. The heart rate starts at 80, decreases to 60 at 10 min, increases to 120 at 30 min, stays at 120 until 40 min, increases to 140 at 50 min, decreases to 100 at 65 min, increases to 160 at 75 min, and decreases to 100 at 90 min. On which interval is the target heart rate strictly increasing then strictly decreasing?

FirstInTest · Accepted Answer

Let's analyze each interval:
A) Between 0 and 30 minutes: The heart rate decreases from 0-10 min, then increases from 10-30 min. This is not strictly increasing then strictly decreasing.
B) Between 40 and 60 minutes: The heart rate increases from 40-50 min, then decreases from 50-60 min. This fits the description.
C) Between 50 and 65 minutes: The heart rate increases from 50-60 min, then decreases from 60-65 min. This also fits the description.
D) Between 70 and 90 minutes: The heart rate increases from 70-75 min (from approx 120 to 160), then strictly decreases from 75-90 min (from 160 to 100). This interval shows a clear peak where it strictly increases and then strictly decreases.
Comparing B, C, and D, the question asks for the interval where it is *strictly* increasing *then* strictly decreasing. Option D shows a clear increase from 70 to 75 minutes and then a clear decrease from 75 to 90 minutes, with the peak at 75 minutes. Option B and C also show this pattern, but the graph for D has a more pronounced and continuous change in direction around the peak.

Answer

Between 0 and 30 minutes

Answer

Between 40 and 60 minutes

Answer

Between 50 and 65 minutes

Answer

Between 70 and 90 minutes

Related Questions

More from SAT Maths

Practice Other Global Gateway Exams

Practice More SAT Maths Questions