​ can someone help me with my math problem?

h = -16t^2 + 64t + 80

The time for reaching the max height is     -64 / [ 2 * -16]  =  64 / 32   =   2 sec

Plugging this back into the function, we have

h = - 16(2)^2 + 64(2) + 80    =    - 64 + 128 + 80   =   144 ft