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
This is a trick question. First just understand that any number over itself is 1 so

is just

so it is just
2
Answer:
Its the second one
Step-by-step explanation:
I used slope to solve it
Common ratio, r = (3/2)/(3/20) = 10.
3/20, 3/2, 15,
4th term = 15*10 = 150
5th term = 150*10 = 1500
5th term = 1500