Paul is comparing two high-speed internet service providers (isps) for his business. the graph represents the cost of each isp as a function of t, the duration in months of a service contract.

if c(t) = 180 + 10t represents isp a and c(t) = 25t represents isp b, how long would the service contracts need to be for the total costs to be the same?

a. 6 months

b. 8 months

c. 10 months

d. 12 months