Final answer:
The coefficient 1.5 represents the cost of one headband in dollars in the equation representing Clara's purchases of headbands and socks.
Step-by-step explanation:
The coefficient 1.5 in the equation 1.5h + s = 80 represents the cost of one headband in dollars. This means that each headband that Clara bought cost $1.50. Since the cost of headbands and socks altogether is $80, and the cost of socks is represented by s, the equation shows how to calculate the total cost depending on the number of headbands (h) and pairs of socks (s) she purchased.