Two radical expressions with the same degree and the same are called like terms.

Radicand-apex

Step-by-step explanation:

Two radical expressions with the same degree and the same radicand are called like terms.

Step-by-step explanation:

All the terms that have same power and vari ables are called like terms.

For example: 3x²y and 5x²y are like terms, 2x³ and 7x³ are like terms, etc.

The number under the root is known as radicand.

Two radical expressions are like terms if

1. They have same degree.

2. They have same radicand.

Therefore the two radical expressions with the same degree and the same radicand  are called like terms.

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents