What is "if a(x) = 3x + 1 and mc017-1.jpg?

The function a(x) = 3x + 1 is a linear function. This means that it has a constant rate of change, which is represented by the coefficient of x, in this case, 3. This means that for every unit increase in x, the value of a(x) will increase by 3.

The function mc017-1.jpg is not specified in the question, so it is not possible to provide information about it. It could be another linear function, a quadratic function, or any other type of function.