I think the best way in memorizing the roots of numbers 1 - 30 is by through methods that would suitable for you but you must consider is the pattern in each number or the square, every number has it pattern and i know you realized it by now. I hope this would help
Here is your answer
B) 1/125
REASON:
Given,

for F (3)
Putting x=3, in above function we get


HOPE IT IS USEFUL
Not 100% but all real number so D
Let Base fee be X and No. of Miles be Y.
According to the question
Total Charge= (X+ 88Y)
251.55=20.99+ 0.88Y
Y= 251.55-20.99/0.88
Y= 262 miles
You can set proportions up 4 ways.
See picture. Sorry you got the wrong answer.