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MIT 18.01 Single Variable Calculus (OCW) 8 Online
OpenStudy (anonymous):

A straight line is concave up

OpenStudy (anonymous):

A straight line f(x) has not any concave shape, the first derivative f'(x) gonna be a constant, and f''(x)=0 and zero isn't positive or negative, in other word the rate of change of the slope is equal zero.

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