Answer:
87.5
Step-by-step explanation:
By completing the square,
y
=-14x^2+70x
=-14(x^2-5x)
=-14(x-5/2)^2+175/2
the max. height=175/2
i.e. 87.5
Lets analyse, the sequence adds 20 to the previous term, so that is:
f(n + 1) = 20 + f(n)
where f(1) = 110
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