What’s the answer!!! Please help ASAP

Answer: It equals y to the twentieth power.
Step-by-step explanation: when you have a power to a power, like this example, it's essentially saying, y to the power of 4 times y to the power of four times times y to the power of 4 times y to the power of 4 times y to the power of 4, so y to the fourth is being repeated 5 times, so just multiply 5*4 to get 20.
Answer:
y²⁰
Step-by-step explanation:
(y⁵)⁴ is the same as writing y⁵×y⁵×y⁵×y⁵ 4 times. For the exponent, all you have to do is add all the 5's and you'll get y²⁰. I hope this helps:)