The cost, c(x), for a taxi ride is given by c(x) = 2x+4.00, where x is the number of minutes. what does the slope mean for this equation. a, the rate of change of the cost the taxi ride is 4.00$ per minute (b. the rate of the change of the cost of the taxi ride is 2.00$ per minute (c. the taxi ride costs 2.00$ per trip. (d. the taxi ride costs a total of 4.00$