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Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)