Angle 1 = (140-40)/2
Angle 1 = 100/2
Angle 1 = 50
Answer:

Step-by-step explanation:
we know that
To find out how long is Ms.Smith’s bulletin board, multiply Mrs . Porcelli’s bulletin board by 3
so

but first convert mixed number to an improper fraction
so

substitute

convert to mixed number

V/a = 3/5
a = 20
v = ...
3/5 = v/20
5v = 20*3
5v = 60
v = 60/5
v = 12 oz
Find the average :8.4+7.5+12.9+10.6 divided by four