So here are some problems I'm having issues with. If you can help it would be appreciated.

An engineer wishes to buy a house but can only afford monthly payments of $1500. 30-year loans are available at 5.75% yearly interest compounded monthly. If the engineer can make a $20,000 down payment, what is the price of the most expensive house that the engineer can afford to purchase? Calculate the net present value (NPV) and annual equivalent value (AE) of the following cash flow diagram. The Minimum Acceptable Rate of Return (MARR) is 15%. Calculate the IRR for the cash flow diagram. Calculate the ERR for the cash flow diagram. Determine whether an investment made according to this cash flow is more profitable than "doing nothing" and just collecting the MARR. Explain your