He bought 5 science books and 2 Math Books
5 Science Books = $300
2 Science Books = $100
7 Books = 400
The square root of 141 =

This is because the two factors are 3 and 47, which both aren't perfect squares. You cannot take anything out.
If you want it simplified (like with a calculator) it would be:
Underscore is that line lowered
Answer:
4
Step-by-step explanation:
The greatest common factor (GCF) is the highest factor of two numbers...
4 (4) = 16
3 (4) = 12
4 is a factor of both 12 and 16. It is also the greatest factor of the two numbers. For example, 2 is also a factor of 12 and 16. However, it is not the greatest number... 4 is.