Question

1. what is the variable in the expression $4z - 7$?

a. $-4z$

b. $z$

c. $4$

d. $-7$

Explanation:

A variable is a symbol that represents an unknown quantity. In the expression \(4z - 7\), \(z\) is the symbol standing for an unknown value, while 4 (coefficient) and -7 (constant) are fixed numbers. Thus, the variable is \(z\).

Answer:

b. z