4)
a + 5 = -5a + 5 / +5a;
6a + 5 = 5 / - 5;
6a = 0 / /5;
a = 0.
I’m pretty sure it’s the victim did not have a venomous bite, move the a^-4 up and the b^-4 down so the expression would be a^5a^4/b^4b^3, you would multiply them which makes you add the exponents which would make it a^9/b^7. Hope this helps :)
Add up the length of all 4 sides
Since the 90% is 63. divide it by 9. then you would get value of 7. then multiple it by 10.
which is equal to 70. so 100% is 70.