Final answer:
Option a. -X has a coefficient, which is the implied number -1. The other options do not have a variable, so they do not have coefficients.
Step-by-step explanation:
The student has asked which of the expressions presented has a coefficient. In algebra, a coefficient is a numerical or constant quantity placed before and multiplying the variable in an algebraic expression (e.g., 4 in 4x). Regarding the provided options:
- a. -X has an implied coefficient of -1.
- b. 34 is a constant with no variable, so it does not have a coefficient.
- c. 7(4) is simply a multiplication of two constants, resulting in 28, and since there is no variable, it does not have a coefficient.
Therefore, the expression that has a coefficient is a. -X with a coefficient of -1.