How do I find the correct y intercept and maximum point? Plz show how you got the answer.

Answer:
(0, 4)
Step-by-step explanation:
Look carefully at the y-axis. What is the y-coordinate where the curve crosses the y-axis? It's y = 4. Thus, the y-intercept is (0, 4).
It just so happens that (0, 4) is also the maximum of the function represented here.