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radius of circle o has a slope of 2.5. what is the slope of the line tangent to circle o at point a?

a)0.8
b)2.5
c)-0.4
d)-5

If the line is tangent to circle at point A and the radius ( suppose AO) has a slope of 2.5 then a slope of the tangent line is :

Explanation: The product of slopes of two perpendicular lines is -1. To get second slope we have to divide -1 by the first one.
C) - 0.4