I need help on this one guys :(

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

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?

4percent of a number is what fraction of that number? ? i really need asap