The following problem sets in the textbook: 1.4 1.6 1.7 1.20 3.1 3.3 3.12 You will need the excel file below for problem 3.12 WorkHoursNeeded.xlsx Download WorkHoursNeeded.xlsx Please submit your answers in a Word or PDF file. Show your work Note: Questions 1.4, 1.6 and 1.7 are on page 19, Question 1.20 is on page 23, and Questions 3.1, 3.3 and 3.12 start on page 122. Please submit your answers in a Word or PDF file. Note: Questions 4.3, 4.7, 4.9, 4.11 and 4.12 start on page 159 (at the end of section 4.1), and Questions 4.19 and 4.23 start on page 167 (at the end of section 4.2.)