Answer:
56
Step-by-step explanation:
I don't quite understand your question but I assumed you meant what is 70% of 80
The averages are very different because there was a wide range of test scores among students
First find angle EBC.
The are for a triangle is 180 degrees.
It is a right triangle and has a right angle.
180 - (90 + 50)
180 - 140
angle EBC IS 40
NOW FIND X
The line is 180 degrees.
180 -40 = 140
X = 140 DEGREES
