What is the measure of def

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets, x, and the number of student tickets, y. find the solution and explain what it means. i'll you if you me

Ineed in figuring out this problem.