Question

line segment ab measures 18 units.
what is d, the distance between tick marks on the number line?
○ 1 unit
○ 2 units
○ 3 units
○ 9 units

Explanation:

Step1: Count tick gaps between A and B

Count the number of intervals between tick marks from A to B: 6 gaps.

Step2: Set up equation for total length

Let $d$ be the distance per tick gap. Total length $AB = 6d$, and $AB=18$.
$$18 = 6d$$

Step3: Solve for $d$

Divide both sides by 6:
$$d = \frac{18}{6}$$

Answer:

3 units