please help with questions attatched.

a) Use the standard Solow model to explain why capital accumulation by itself cannot be a source for long-run economic growth. (5 Marks) b) The Romer model focuses on the production of (non-rival) ideas. In class we assumed the production function for ideas to be A = A(1 - D)L. Explain what would happen to long-run growth if instead the production function for ideas is A = A* (1 - D)L with 8 > 1 and I, L constant. Hint: First calculate the growth rate A/A and sketch it in a time vs. A/A diagram. (10 Marks)