Anumber;
1. a term containing no variables variable.
2. one term or multiple terms connected by an addition or subtraction sign expression.
3. an equation that uses variables to state a rule term.
4. a number or a variable, or the product of a number and variable(s) constant.
5. a letter or symbol used to represent an unknown number.

First option is correct.

Step-by-step explanation:

A number in an expression is a term that contains no variables.

So, it is known as constant term.

if any term is with variable or variables, then it can't be consider as a number.

Then, it becomes only a term.

But if there is no variables in a term is present, then it is called to be number.

Hence, First option is correct.

the answer for your question is

step-by-step explanation:

the answer is 18 units because there are 18 small cubes inside the rectangle

hope this and p.s i am also in k12

step-by-step explanation: