Identify the height for the function: f (t) = 5sec(3t − π) + 1

(t) = 0 gives 
-24t + 60 = 0 
t = 2.5 
For this t, the second derivative s"(t) = -24 is negative. And so, s(t) is maximum for t = 2.5. 
Maximum height is S = -12(2.5)^2 + 60(2.5) +8 = 233ft

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!