Solution :
Group Before After
Mean 693.75 743.75
Sd 155.37 143.92
SEM 54.93 50.88
n 8 8
Null hypothesis : The preparation course not effective.

Alternative hypothesis : The preparation course is effective in improving the exam scores.
(after - before)
The answer is 5.
You just plug whatever number is in the f(?) part in for x!
Answer:
192°
Step-by-step explanation:
x + y =360°-( 64° + 104° )=360°- 168°= 192°