Since you're looking for the unit rate, you can start do this:

And yes,

is also correct, it's just switching around the 15
Answer:
44
Step-by-step explanation:
Parenthesis
Exponents
Multiply
Divide
Add
Subtract
First we need to do the work inside the parenthesis that are in the boxed parenthesis
3 + 1 = 4
4 * 5 = 20
Now we multiply
20 * 2 = 40
Now we add
40 + 4 = 44
Best Of Luck,
- I.A. -
The formula is 1/2 x P x L + B
P=perimeter
L=Side length
B= Slanted Base length
ANSWER= 8 mi