Question

which number line model represents the sum of $1.5 + (-5)$?

Explanation:

Step1: Simplify the given sum

$1.5 + (-5) = 1.5 - 5 = -3.5$

Step2: Analyze number line logic

Start at 1.5, move left 5 units:
$1.5 - 5 = -3.5$
This means the number line should first plot a point at 1.5, then draw an arrow 5 units to the left, ending at -3.5. Among the options, the top-right number line matches: it starts at 1 (adjusted for half-unit, the first short segment accounts for 0.5 to reach 1.5, then moves left 5 units to -3.5, aligning with the tick marks).

Answer:

The top-right number line model (starting near 1, moving left 5 units to the left of -3) represents $1.5 + (-5)$.