<span>89 is the correct answer.
</span>
From the information given,
Students ticket = $4
Adult ticket = $6
Let student ticket be x, and adult ticket be y.
This means;

ANSWER:
The calculations show that Jerome spent a total of $40

Solution (1)



for k=0 / for k=1 / for k=-1
x=0 / x=2π / x=-2π
acc / acc / rej
solution (2)




for k=0 / for k=1 / for k=-1
x=0 / x=2π/3 / x=-2π/3
acc / acc / rej
Note that i'm trying values of K which make the answer belong to our interval;
So our solution which i will represent as a set is;
S € {0,2π/3,2π}