Answer:
D
Step-by-step explanation:

Which is about .57
Part (b)
We use the result of part (a) and plug in (x,y) = (0,0). This is directly from the initial condition y(0) = 0.

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This means,

is the solution with the initial condition y(0) = 0.
The midpoints between 4 and 8 would be 6 because 4 5 6 7 8, the middle term is 6