1. The problem asks to find the value of $d$ on a number line between 7.9 and 9.4. 2. Since $d$ is positioned between 7.9 and 9.4, and the problem implies it is the midpoint, we use the midpoint formula for a number line: $$d = \frac{7.9 + 9.4}{2}$$ 3. Calculate the sum inside the numerator: $$7.9 + 9.4 = 17.3$$ 4. Divide by 2 to find the midpoint: $$d = \frac{17.3}{2} = 8.65$$ 5. Therefore, the value of $d$ is 8.65.