https://lh6.googleusercontent.com/poivZNqu6U6k_7as2_WtgkNz2G0o0zKN5SREtHB8BlZAyoXeaSsf8uAsxqlhKWZ-FaH5fo4z83Z0x9zFPFvYw659lvGZn9t8yDbAuAoX0ldnqCoqEfhbp1mePRIe-w=w388

Question

The link is to the picture

Answer 1

The max height will occur at the vertex. To find it manually, you can find the x coordinate using the following formula:

x = -b/(2a) Once you find the x coordinate, plug it into the original equation to find y, that will be the max height.

I used my TI-84 instead and found the vertex to be (2.8125,126.5625)

The max height is approximately 127 ft.