what does this equal? show your work pls

Answer:
[tex]-0.421875[/tex]
Step-by-step explanation:
Turn the fraction to a decimal.
[tex]-\frac{3}{4}[/tex] ⇒ [tex]-0.75[/tex]
Solve the exponent.
[tex]-0.75^3[/tex] ⇒ [tex]-0.421875[/tex]
Thus, [tex]-0.421875[/tex] is the answer.