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: Analyze the first table

Check the speed trend: 45 → 43 (decrease), 43 → 41 (decrease), 41 → 42 (increase), 42 → 43 (increase). This is not increase then decrease.

Step2: Analyze the second table

Check the speed trend: 45 → 47 (increase), 47 → 49 (increase), 49 → 48 (decrease), 48 → 47 (decrease). This is increase then decrease.

Step3: Analyze the third table

Check the speed trend: 45 → 45 (constant), 45 → 45 (constant), 45 → 43 (decrease), 43 → 41 (decrease). This is not increase then decrease.

Step4: Analyze the fourth table

Check the speed trend: 45 → 43 (decrease), 43 → 41 (decrease), 41 → 41 (constant), 41 → 41 (constant). This is not increase then decrease.

Answer:

The second table (Time (min): 5, 6, 7, 8, 9; Speed (mph): 45, 47, 49, 48, 47)