Question: Use Eq. (11) to find the t-intervals on which c(t) = (t 2 , t 3 4t) is concave up. dy x' (t)y(t)- y'

Use Eq. (11) to find the t-intervals on which c(t) = (t2, t3 − 4t) is concave up.

dy x'(1)y

dy x' (t)y"(t)- y' (t)x"(t) dx x'(1)

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