f(36)
Step-by-step explanation:
f(3)=5(3)²-9(3)+18
f(3)=5(9)-27+18
f(3)=45-27+18
f(3)=36
13.33%
say 50 oranges, then 100 apples
80 are red, 20 are yellow
total fruit = 150
20chances out of 150 for yellow
20/150 = 13.33%