Find the zeros of the function. You may want to view the graph of the function to help you identify the real root, then use it to depress the polynomial & find the remaining roots. f(x) = x3 + 5x2 – 3x - 15 O{-5, -73, 3} O{-5, -3, 3} O {5, -3, 3} - O{-V5, -V3, V3

Astudy of 80 english composition professors showed that they spent, on average, 14.6 minutes correcting a student's term paper. construct and interpret a 90% confidence interval of the mean time for all composition papers. assume that the population standard deviation is 2.9 minutes. round to 1 decimal.