Question

1. 63, 19.2, -1 like terms unlike terms
2. 16a, -a, \frac{1}{10}a like terms unlike terms
3. 5z, 5x, 5y like terms unlike terms

Explanation:

Step1: Identify like terms (Q5)

Like terms have same variable/no variable. $63, 19.2, -1$ have no variables.

Step2: Identify like terms (Q6)

Like terms have same variable. $16a, -a, \frac{1}{10}a$ have variable $a$.

Step3: Identify unlike terms (Q7)

Unlike terms have different variables. $5z, 5x, 5y$ have $x,y,z$.

Answer:

1. like terms
2. like terms
3. unlike terms