Answer: D. Earlier, Rick had seemed uninterested; today, he looked downright enthusiastic.
Explanation: It's a continuation of the sae subject so you use ; (semi-colons).
64^(-1/3)
First step: Remove the negative sign of the exponent by switching the numerator and denominator.
(1/64)^1/3
When an exponent is in a fraction form, the numerator is the power the base will be raised to while the denominator is the root.
Second step: find the cube root.
(∛1/64)^1
(∛1/∛64)^1
Third: raise to the power.
(1/4)^1
1/4 or 0.25
64 to the negative 1 third power is 1 OVER 4.
