Final answer:
The equation m = h * p can be used to represent the relationship between the number of hours Deirdre baby-sits and the amount of money she earns, where p represents the amount she earns per hour.
Step-by-step explanation:
To represent the relationship between the number of hours Deirdre baby-sits (h) and the amount of money she earns (m), we can use the equation m = h * p, where p represents the amount she earns per hour. In this case, Deirdre earns $24 for 3 hours, so we can substitute these values into the equation to find the value of p: 24 = 3 * p. Solving for p, we find that Deirdre earns $8 per hour.