10 is what percent of 625

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

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?