4-6. simplify the expressions below. homework ✎ a. 8 − 13 − (−4) b. 4 − (−7) + (−2) c. −7 + 3 − 20 4-7. copy each expression and simplify it. show all of your steps. homework ✎ a. 1.234 + 0.58 + 5.316 b. 6.1 − 1.536 c. 4.8(0.6) 4-8. tina's rectangular living-room floor measures 15 feet by 18 feet. homework ✎ a. how many square feet of carpet will tina need to cover the entire floor? b. the carpet tina likes is sold by the square yard. how many square yards will she need? (1 yard = 3 feet)