Which of the following includes a coefficient? A \( 3 x+2 \) B \( a^{2}-.1 \)

To determine which of the given expressions includes a coefficient, we need to understand what a coefficient is. A coefficient is a numerical factor that multiplies a variable in an algebraic expression. Let's analyze each option: A. \( 3x + 2 \) - In this expression, \( 3 \) is the coefficient of the variable \( x \). B. \( a^{2} - 0.1 \) - In this expression, there is no coefficient multiplying the variable \( a^{2} \). The term \( -0.1 \) is a constant, not a coefficient of \( a^{2} \). Based on this analysis, the expression that includes a coefficient is: **A \( 3x + 2 \)**.