Please please pls help me with this it’s a test i do not wanna get it wrong and please no links tysm i will give u thanks and brainliest if u help

explanation was in pic

the answer is "42"

When you have a negative power of a fraction, you can solve this way:

(5/6)^-4 = 5^-4/6^-4 = 6^4/5^4 = (6/5)^4

Another way to change a negative power of a fraction is to write the reciprocal of the fraction and change the power to positive.

(5/6)^-4=(6/5)^4