A sandwich store charges a $10 delivery fee, and $4.50 for each sandwich. a. What is the total cost (sandwiches and delivery charge) if an office orders 6 sandwiches?

b. What is the total cost for x sandwiches? Write an equation in slope intercept form.

c. Graph the total cost of sandwiches and delivery based on number of sandwiches ordered. Be sure to label your axes and scale them by labeling each gridline with a number. Please use a piece of graph paper or screen capture and edit digitally. You will upload a picture of your graph in the next question.

(Because there are 3 parts to the question, you get 15 points)

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: