Answer:
-6.3
Step-by-step explanation:
7/10 X -9/1 = -63/10 = -6.3
Answer: 249
Step-by-step explanation: 210+698-812+1453-1300
B) 131°
-4a + 139 = 4a + 123 because they are vertical angles
-4a + 139 = 4a + 123
reduce:
8a = 16
a = 2
4(2) + 123 = 131°