Please explain in depth how to solve each question these were very confusing for me conceptually and in general. thank u

You are offered an investment opportunity that will begin with a cash inflows of 19,000 at the end of year one, growing each year by 5% for 20 years. What is the most you'd pay for this investment today if your required rate of return is 12% ? (please explain this one if possible) A friend tells you they will pay you and your descendants $100 per year forever. Discount rate is 4%. What is this stream of cash flows worth today