If tan (x)+pi/6=0
thn
tan (x)=-pi/6
take atan of both sides
x=atan (-pi/6)
x= -0.4823 rad
= -27.636 deg
The mean that the library and calculated is not correct. Her mistake was she divided 55 by 8 instead of dividing by 10.
Please see the attached picture for the work in finding the correct mean of 5.5 books.
If you divide the numbers on the bigger triangle by 5 you get the numbers on the smaller one
I believe there is more to the question because there is not enough information for a valid answer.
Answer:
B I'm not 100 percent sure that it's right but I'm pretty sure.