10t-640/t^2 = 0

Question

Thank you so much for huge help:)))

Answer 1

Assuming the usual carelessness with parentheses, I read this as

(10t-640)/t^2 = 0

a fraction is zero if the numerator is zero. So,

10t-640=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

Answer 2

Thank you so much:)))