Question

number of calories burned
0 1 2 3 4 5 6 7 8
number of hours spent walking
which of the following statements describe the graph shown above? select two that apply.
a. at 0 hours, 120 calories are burned.
b. to burn 480 calories, an individual must walk for 4 hours.
c. walking burns calories at a rate of 120 calories per hour.
d. to burn 120 calories, an individual must walk for 2 hours.
e. an individual that walks for 5 hours burns less than 500 calories.

Explanation:

Step1: Find the slope (rate)

Slope = $\frac{\Delta \text{Calories}}{\Delta \text{Hours}} = \frac{960-0}{8-0} = 120$ calories/hour. So statement C is correct.

Step2: Check statement B

At 4 hours, calories = $120 \times 4 = 480$. So B is correct.

Step3: Verify other statements

A: At 0 hours, calories = 0 (not 120). D: 120 calories need $120/120=1$ hour (not 2). E: 5 hours burn $120×5=600$ (more than 500).

Answer:

B. To burn 480 calories, an individual must walk for 4 hours, C. Walking burns calories at a rate of 120 calories per hour.