Devonte used the change of base formula to approximate log Subscript 8 Baseline 25. Which expression did Devonte use?

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Two and nine tenthsfifty and thirty-two hundredths four and 16 thousandthsseven hundred twelve and 8 hundredths

Choice 3 is the answer. 1 square equals 1, 1 cube equals if the base is equal to 1, x will always be 1.