Answer:
im not sure how to help u just try using a caculator
Step-by-step explanation: sorry
Answer:
x = - 
Step-by-step explanation:
Multiply through by 4 to clear the fraction
15 - 28x = 36 ( subtract 15 from both sides )
- 28x = 21 ( divide both sides by - 28 )
x =
= - 
Angle a is 80, angle d is 100, angle c is 100
The 3 angles of a triangle, when added, = 180 degrees
so if 2 of them are 70.....70 + 70 = 140
then the 3rd will be 180 - 140 = 40 degrees <==