Shawn said that you can use the properties of operations to solve the problems shown using mental math only. Identify the strategy that Shawn used for each problem. Then, evaluate the expression.

Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.

The diagram shows a cuboid abcdefgh abcd is a square with area 25cm². find the volume of the cuboid.

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: