Answer:
256/81
Step-by-step explanation:
a⁻ᵇ = 1/aᵇ
(a/c)ᵇ = aᵇ / cᵇ
1/(c/d) = d/c
then:
(-3/4)⁻⁴ = 1/(-3/4)⁴ = 1/(-3⁴/4⁴) = 1/(81/256) = 256/81
