Talia’s gym membership costs her $75 per month plus an additional $30 for each month that she chooses to bring a guest. which equation can be used to find the number of months talia brings a guest if she spends $990 on a year-long membership?
group of answer choices

a. 990 = 75(12) + 30(12 − n)

b. 990 = 75(12) − 30n

c. 990 = 75n + 30(12)

d. 990 = 75(12) + 30n