Compute Δy and dy for x = 4 and dx = Δx = 1.

so i have found that dy = 1/4

and I know that Δy=f(x+Δx)-f(x)

and because x and Δx are given, we have

f(4+1)-f(4) = f(5)-f(4) right?

where do i go from here?

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