Answer:
The coefficient in the given algebraic expression is:
2
Explanation:
We are given an algebraic expression in terms of the variable c as follows:

We know that the coefficient of a linear expression is the constant value that is placed before the variable on multiplying with that variable.
Here we have two terms:
42 and 2c such that they are separated by a addition sign.
Now, the term 2c is a variable term such that it is obtained when 2 is multiplied with the variable c.
Hence, 2 is the coefficient of the expression.