what is f(x) for the following Reimann sum?

Question

For the following sum 

√(6+(3/n))(3/n)+√(6+(6/n))(3/n)+…+√(6+(3n/n))(3/n)

is a right Reimann sum for the definite integral ∫f(x)dx with upper bound b and lower bound 3 

what is b?

what is f(x)?

 

It is also a Reimann sum for the definite integral ∫g(x)dx with upper bound c and lower bound 6 

what is c?

what is g(x)?

Answer 1

b = 3; f(x) = (6 + x)^1/2.

c = 9; g(x) = x^1/2