Tavon has a gift card for $130 that loses $5.50 for each​ 30-day period it is not used. He has another gift card for $ 100 that loses $ 4 for each​ 30-day period it is not used. a. Assuming both cards are​ unused, write and solve an equation for the number of​ 30-day periods until the value of the gift cards will be equal.

a. What will the value of each card be when they have equal​ value?