Question

This graph shows the relationship between a worm's age and its length.

The graph titled worm size shows length in centimeters on vertical axis from 0 to 10 in increments of 2 and age from 0 to 10 on the horizontal axis in increments of 2. The points (1,4), (2, 4.5), (3, 5), (4,5.5), (5, 6), (6,6.5), (7, 7), (8, 7.5), (9, 8), (10, 8.5) are joined.

Based on the graph, at what age is the worm's length equal to its age?
A.

5

B.

6

C.

7

D.

8

Answer 1

To find the age at which the worm's length is equal to its age, we need to identify the points where the value of age (x-axis) equals the value of length (y-axis).

From the graph points provided:
- At age 1, length is 4 (not equal)
- At age 2, length is 4.5 (not equal)
- At age 3, length is 5 (not equal)
- At age 4, length is 5.5 (not equal)
- At age 5, length is 6 (not equal)
- At age 6, length is 6.5 (not equal)
- At age 7, length is 7 (equal)
- At age 8, length is 7.5 (not equal)
- At age 9, length is 8 (not equal)
- At age 10, length is 8.5 (not equal)

The only point where the worm's length is equal to its age is at age 7.

Therefore, the answer is **C. 7**.