Please help me with this.

Will give a: 122 b: 90 c: 48 d: 180

What is the simplified form of square root of 400 to the 100th power ?

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?