Question

Which out of the following are expressions with numbers only?
A. y+3
B. \[\left( 7\times 20 \right)-8z\]
C. \[5\left( 21-7 \right)+7\times 2\]
D. 5
E. 3x
F. 5-5n
G. \[\left( 7\times 20 \right)-\left( 5\times 10 \right)-45+p\]

Answer 1

Hint: In this problem, we have to find the expression only with numbers among the given options. We can see that the given options contain some of the variables with numbers, but here we have to find the expression only with numbers. Variables are nothing but the unknown numbers, represented by any of the alphabets and constants are numbers. We can now find the expression with numbers only from the given options.

Complete step-by-step solution:
Here we have to find the expression with numbers only from the given options,
A. y+3
B. \[\left( 7\times 20 \right)-8z\]
C. \[5\left( 21-7 \right)+7\times 2\]
D. 5
E. 3x
F. 5-5n
G. \[\left( 7\times 20 \right)-\left( 5\times 10 \right)-45+p\]
Here we can see that, the option. A has y in it which is a variable.
We can see that option. B has the variable z in it, so it is not the answer.
From the option. C we can see that, only numbers form an expression, so option. C is one of the solutions.
We can see that option. D also has only a number, so it is also an answer.
Now form Option. E, F, G we can see that there are some variables, so these do not include in the solution.
Therefore, the expression which contains only numbers is an option. C and D.

Note: We should know the major difference between the constant and the variables to solve these types of problems as variables are nothing but the unknown numbers, represented by any of the alphabets and constants are numbers.