Question $1)$How do you estimate the $$value of the firm$$ when free cash flows of the firm are uneven for the first few years $($based on bottoms up proforma for first few years$)$ but stay constant after?

Question $2)$Using the Discounted cashflow approach, why are projected free cash flow, rather than profits, used in estimating the value of the firm?

Question $3)$What is the role of WACC in valuation