I would like to know if somebody could help me on this math problem.

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.