The problem is "h+35=15".
Subtracy 35 from each side, so h=-20.
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35
(7h + 35) / (-7) = (7h)/(-7) + (35)/(-7) = (-h) + (-5) = - (h + 5)
(t+h)(x+2)
-7h = 35h = -5
H = 1 + sin(3t) When t = 5, H = 1 + sin(15) = 1 + 0.2588 = 1.26 metres, approx.