Which expression is equivalent to 512 in exponential form?

Nine more than four times a number is the same as one less than twice the number. find the number?

Rewrite so the subject can be y in the formula d=m-y/y+n

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?