Later on in this chapter, we will find the slope of the line tangent to the graph of f(x) = x2 + 3x at the point x = 1. For now, we will: 1. Find the derivative of f'(x). 2. Substitute x = 1 into f'(x) to get the slope of the tangent line. What is the slope of the tangent line? Type your answer as a number