The slope of any line perpendicular to ab , where a(0, -3) and b(4, 9) are two points on the line, is m =
-3
-1/3
3

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The function show two sisters' savings account and the rate at which they plan to deposit money

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.