Which of the following functions are written using function notation? g (x) = 5x + 2 y = 1 x h = x2 r (x) = x f/x = x5 - 3 b (x) = 1 2 x3 p/x = - 7x k (x) = - 3 x + 1 y = mx + b fx = - x3 + 4

We are given : g (x) = 5x + 2.

y = 1 x

h = x^2

r (x) = x

f/x = x^5 - 3

b (x) = 1/2 x^3

p/x = - 7x

k (x) = - 3 x + 1

y = mx + b

fx = - x^3 + 4

Note: Function is written in the from of f (x) and read as function f of x.

There could be any letter used for function, like h (x), g (x), k (x).

Therefore, in the given options the following are in function notations only:

g (x) = 5x + 2.

r (x) = x

b (x) = 1/2 x^3

k (x) = - 3 x + 1.