To find the initial value from the equation \( T(x) = 2x + 10 \), we need to evaluate \( T(x) \) when \( x = 0 \). This represents the temperature at noon (0 hours after noon).
Substituting \( x = 0 \) into the equation:
\[ T(0) = 2(0) + 10 = 10 \]
So, the initial value (the temperature at noon) is \( 10 , \text{°C} \).
The correct response is:
10°C