One pump can empty the pool in 36 hours. The second pump is twice faster. After both pumps, working together emptied 13 of a pool the second pump broke. The first pump finished the job. How long did it take to empty the pool?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

You are in charge of the customer service phone line with many employees. at the end of each phone callthe customers are asked to rate their service from 1 to 5 stars, with 5 being the best. you find the averagerating for 20 randomly selected employees and decide you want to improve the ratings so you require thoseemployees to go through a new training program. you then wait a week and find the new average rating foreach employee. the average change is an increase in 1.3 stars with a standard devation of .9 stars.(a) is this data paired or not paired? (b) what are the null and alternative hypothesis being tested? (c) what is the t-statistic you would use? write the general formula and the final calculation.(d) sketch a t-distribution, label your t-statistic and the probability you would be interested in:

Place the indicated product in the proper location on the grid. -4x3y2(7xy4)