math
posted by Lucas .
10t640/t^2 = 0
Thank you so much for huge help:)))

Assuming the usual carelessness with parentheses, I read this as
(10t640)/t^2 = 0
a fraction is zero if the numerator is zero. So,
10t640=0
t = 64
Now, if you meant
10t  (640/t^2) = 0
then clear the fraction and we have
10t^3  640 = 0
t^3 = 64
t = 4 
Thank you so much:)))