Answer:
The last one
Step-by-step explanation:
1/256 can only be a non fraction is the exponent is negative. but since the t is not also in the denominators the original two exponents must be negative so they times to a positive so:
(4t^-4) ^-7
(4^-7) (t^-4×-7)
(1/4^7) (t^28)
1/256 t^28
