Three questions, 38 points simplify the first picture second question simplify the second picture third question simplify the third picture

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

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?

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.