Final answer:
The value of x is calculated by solving the equation 39 = 3(-4x + 7). After simplifying, we find that x = -1.5, which does not match any of the provided options.
Step-by-step explanation:
To find the value of x when the given range of the function y = 3(-4x + 7) is 39, we'll set the equation equal to 39 and solve for x.
Starting with the given equation:
y = 3(-4x + 7)
Now, set y to 39 and solve for x:
39 = 3(-4x + 7)
Divide both sides by 3 to simplify:
13 = -4x + 7
Subtract 7 from both sides to isolate the term with x:
6 = -4x
Now, divide both sides by -4 to find the value of x:
x = -\(\frac{6}{4}\) = -\(\frac{3}{2}\) = -1.5
However, this solution is not listed in the given options, indicating there might be an error in the provided answers or in the interpretation of the range (the value of 39).