You are missing part of the question
First, convert 45 minutes into hours:
45/60=0.75
then, write the expression:
0.75*d / 0.75d
Y = 2x
y = 2*(-15) = -30 . . . . . selection A is appropriate
Answer:
8$ per hour
Step-by-step explanation
First, we need to find how many hours Naomi worked, total.
Simply add 
Now we know that Naomi earned 54$ over 6.75 hours.
All we have to do to find the hourly rate is divide 
Naomi earns 8$ per hour mowing lawns.
The answer your looking for is B because when you multiply the 1000 by 4 you get 5.4