calculus-answer check

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1. Determine the slope of the tangent to the graph of y=4/x at (1,4)

my answer is -4

2.What is the slope of the line perpendicular to y=(x-2)/(x+2) at (2,0)

my answer is -4

3. For which value of x is the derivative of f(x)=(x-1)^10(x+2)^5 equal to 0?

my answer is 1

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