Answer:
-4 and 9
Step-by-step explanation:
-4 + 9 = 5
-4 x 9 = -36
6*17
6*7=42
6*17=42
6*17=60
6*17=42+60
=102
8 sand bags
300 - 140 = 160
160 ÷ 20 = 8
8 sand bags of 20-pounds each.