a family walked 240 miles in 4 hours yesterday at this rate how many hours will it take to walk another 150 miles

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)

Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?