The answer is 180°
Angles between straight lines are 180°
Hope this helps :))
-60 -49 -40 9
-45 -18 80 82
-74 -23 14 85
-79 -68 21 46
-48 -21 27 54
-68 -13 4 32
-3(b + 9) = -9
First, divide both sides by -3. / Your problem should look like: b + 9 =
Second, simplify

to

/ Your problem should look like: b + 9 =
Third, simplify

to 3. / Your problem should look like: b + 9 = 3
Fourth, subtract 9 from both sides. / Your problem should look like: b = 3 - 9
Fifth, simplify 3 - 9 to get -6. / Your problem should look like: b = -6
Answer:
b = -6