Which expression are correct for the situation?

Tan198=asin164=? how to solve this? ?

Jessica is organizing a guided tour of the rain forest. the average profit per person that the touring company makes is given by the rational expression 18x+35/x, where x is the number of people going on the tour. what does the numerator of this rational expression represents?

Solve for the equation. 4x - 13 = 2x + 9