Final answer:
The expression 67.5 - 7n - m consists of three terms: a constant (67.5), a linear term in n (-7n), and a linear term in m (-m).
Step-by-step explanation:
The expression given is 67.5 - 7n - m. To determine the number of terms in this expression, we simply count how many individual elements there are that are not like terms. In this case, there are three terms: 67.5 (a constant term), -7n (a linear term in n), and -m (a linear term in m). These terms cannot be combined any further as they are all distinct, so the expression consists of three terms.