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.
On which interval is the target heart
rate strictly increasing then strictly
decreasing?
IGO
120
Target heart rate (beats per minute)
0
40
0 10 20 30 40 50 60 70 80 90 100
Timis (
mm)
O Between 0 and 30 minutes
Between 40 and 60 minutes
O Between 50 and 65 minutes
Between 70 and 90 minutes​

Answer 1

what is thissss?????????