Answer: i think its 4^0
Explanation:
PEMDAS says you do multiplication before division so youll solve from left to right!
When multiplying numbers with exponents, if the exponents have the same base (which in this case they are all 4) then you can add the exponents together. So you would add 5 + -7 (which is the same as 5-7 btw) which gives you -2. So now you have 4^-2 ÷ 4^-2! Since they still have the same base of 4 when dividing you can subtract exponents so -2 - (-2) (which is the same as -2 +2) which equals 0 and thats how i got to an answer of 4^0.
Hope this helps! Sry if it is wrong but im pretty confident in my answer :)