Question

Question 2

In which of the following expressions only numbers are used:

(a) y + 3

(b) $(7\times 20)-8z$

(c) $5(21-7)+7\times 2$

(d) 5

(e) 3x

(f) 5-5n

(g) $(7\times 20)-(5\times 10)-45+p$

Answer 1

(c) and (d) are the expressions with only numbers. All the other expressions have variables. A variable is a letter that represents an unknown number which can take any value.