Hello! could I get a helping hand?

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

Write 37/22 as a decimal rounded to the nearest hundredth.