Hi! I hope this is helpful. :)
Answer:
The equation for the amount of money remaining on the card, A, in terms of the number of cups of coffee, x, is:
A = 30 - (30-12)/6 * x
Step-by-step explanation:
The equation represents the original amount of money on the card, $30, subtracted by the money spent per cup of coffee, which is (30-12)/6 times the number of cups of coffee, x.