Question

a car increases, then decreases, its speed. which table could represent the speed of the car?
time (min) 5 6 7 8 9
speed (mph) 45 43 41 42 43

time (min) 5 6 7 8 9
speed (mph) 45 47 49 48 47

time (min) 5 6 7 8 9
speed (mph) 45 45 45 43 41

time (min) 5 6 7 8 9
speed (mph) 45 43 41 41 41

Explanation:

Step1: Identify increasing phase

Check speed trend from 5-7 min:

• Table1: 45→43→41 (decreasing)
• Table2: 45→47→49 (increasing)
• Table3: 45→45→45 (constant)
• Table4: 45→43→41 (decreasing)

Step2: Identify decreasing phase

Check speed trend from 7-9 min:

• Table2: 49→48→47 (decreasing)

This matches "increase then decrease".

Answer:

B. Time (min): 5, 6, 7, 8, 9; Speed (mph): 45, 47, 49, 48, 47