Y= 1/4x if x is 20, what is the value of y ?

Anyone know? is appreciated! will mark brainliest if correct!

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap

Write the equation in logarithmic form 8^x=64