Let's analyze the function \( C(d) = 8d + 2 \):
a. To find the cost per box of donuts, look at the coefficient of \( d \) in the function. The cost per box of donuts is \( 8 \) dollars.
b. The flat rate shipping charge is the constant term in the function, which is \( 2 \) dollars.
c. To find the total cost to order 3 boxes of donuts, substitute \( d = 3 \) into the function:
\[ C(3) = 8(3) + 2 = 24 + 2 = 26 \]
So, the total cost to order 3 boxes of donuts is \( 26 \) dollars.
d. Finding \( C(-2) \) does not make sense in the context of this function because \( d \) represents the number of boxes of donuts ordered, and it cannot be negative. Therefore, \( C(-2) \) is not a valid inquiry in this context.