A hair salon in downtown Flagstaff has found that they can expect customers to make 14 more appointments per month for each $60 they spend in advertising. Before they began advertising, they typically had 92 appointments per month. Write a general equation describing the relationship between the number of appointments per month this salon can expect and the amount of money they spend in advertising. For the upcoming month, the salon has arranged for $150 in advertising. How many appointments can they expect? The manager of the salon estimates they could handle at most 160 appointments in one month. How much would they need to spend in advertising to reach this threshold?