Aresearcher wishes to estimate the proportion of adults who have high-speed internet access. what size sample should be obtained if she wishes the estimate to be within 0.01 with 95% confidence if a) she uses a previous estimate of 0.28? b) she does not use any prior estimates?

Idon't see any graph, however the graph of the function : f(x) = x²-2x+3 is a parabola: 1) open upward (since a> 0)2) it intersects y-axis in 3 (y=3)3) its axis of symmetry is x = +1 ( -b/2a)4) it's minimum is y = -2, so its vertex is (1,-2)5) it doesn't intersect the x-axis since discriminant < 0