To determine the number of horses the trainer can train with 42 mints, we need to set up the right equation. Since the trainer needs 5 treats per horse (or per session), the equation can be represented as:
\[ 5h = 42 \]
Where \( h \) represents the number of horses (or sessions).
To solve for \( h \):
\[ h = \frac{42}{5} = 8.4 \]
Since the number of horses (or training sessions) must be a whole number, \( 8.4 \) is not a viable solution. The trainer can train a maximum of 8 horses (sessions) if she rounds down to the nearest whole number.
Thus, the correct response would be:
5h=42, so h=8.4 horses, which is not viable.