Answer:
Step-by-step explanation:
s+1+2s-1+90=180 degree(being linear pair)
3s+90=180
3s=180-90
s=90/3
s=30 degree
If the question is how many shelves are needed, then the answer is 18 shelves.
Answer:
I think elimination method will the the beat and easiest method we can use in that question,
269,296,267,297,279,216,261,217,271,219,291,612,621,617,671,691,619
THERE IS MANY WAYS YOU CAN DO IT! I would right it all down then count it, or go with 100
