Question

which equation represents the model?
3(s + 4) = 30
s + 12 = 30
s + 4 = 30
3s + 4 = 30
chart: three rectangles labeled s+4 each, total length 30

Explanation:

Step1: Analyze the model

There are 3 identical parts, each labeled \( s + 4 \), and their total is 30. So we need to represent the sum of 3 times \( (s + 4) \) equal to 30.

Step2: Translate to equation

Mathematically, 3 times \( (s + 4) \) is written as \( 3(s + 4) \), and this equals 30. So the equation is \( 3(s + 4)=30 \).

Answer:

\( 3(s + 4) = 30 \)