Answer:
The correct option is C
Step-by-step explanation:
From the question we are told that
The number of independent variables is 
The number of observation is 
Since n is are independent variables then their degree of freedom is 3
The denominator(i.e z) degrees of freedom is evaluated as



So for the numerator (n) the degree of freedom is Df(n) = 3
So for the denominator(i.e z) the degree of freedom is Df(z) = 43
If I’m not mistaking it is either 80.29 or 80.30 after rounding,I’m not sure.
Hello! I believe the Surface Area to a rectangular prism= 2(4x5+5x7+4x7). Let me know if i'm wrong. Anyways hope this helps!