What are the variables in this expression? f+2g+h/4-7.1 f and g only 2 g and h only 3 f, g, and mc014-2.jpg only 4 f, g, and h only

4. only.

Step-by-step explanation:

We have been given an expression . We are asked to find the variables in the given expression.

We know that variable is a symbol or letter that represents an unknown value in a mathematical expression.

We can see that in our given expression are unknown, therefore, these are variables for our given expression.

the first line is the correct one

1