3.subtraction of functions: f (x) = -5x2 +27x + 111 ; g (x) = -17x2 + 23x - 15 4.multiplications of functions: f (x) = -5x2 + 4x + 12 ; g (x) =6x-4
5. dividisiona of functions: f (x) = x2 + 8x ; g (x) = x

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

tip $2.90

total $17.40

explanation:

previous steps have made pa≅ pb ≅ st ≅ su. setting the compass width to ab allows you to make tu the same length. then δstu ≅ δpab by the sss congruence postulate, and ∠p ≅ ∠s by the reason cpctc.