The students in your class are going on a field trip. The ratio of teachers to students must be 1 to 7. Which graph shows the number of teachers needed for 28 students?

Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7