Answer
80$t^{13}$
Work Step by Step
(-8$t^{3}$)(2$t^{6}$)(-5$t^{4}$) = (-8)(2)(-5)($t^{3}$$t^{6}$$t^{4}$) = 80$t^{3 + 6 + 4}$ = 80$t^{13}$
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