100+75+70+x= 360° (sum of interior angles of quadrilateral)
x= 360-245= 115°
Answer:
work is shown and pictured
Answer:

Step-by-step explanation:
Fixed monthly fee = $20
Amount charged per minute for long distance calls = $0.20
denotes total cost such that
minutes are used for long distance calls.
Amount charged for
minutes for long distance calls 
Therefore, an equation for the total cost, C, when N minutes are used for long distance calls is 