Take the equations and solve them. they should lead up to degrees. Then add those degrees together and subtract that answer by 360 degrees and that should be your answer.
Hope this helps
Answer:

Step-by-step explanation:
Let's solve this problem step-by-step. The library had 1,500 books in 2011. The ratio of books in 2011 and in 2012 is 1:2. Therefore, let the number of books in 2012 be
.
We have the following proportion:

Therefore, there were 3,000 books in 2012. The ratio of books in 2012 and in 2013 is 2:5. Let the number of books in 2013 be
.
We have:

Therefore, there were 7,500 books in 2013.
Answer:
y = 2/6x
Step-by-step explanation:
graph it.
use graph paper
Answer:
10:40
Step-by-step explanation:
1+4=5
5=50
1=?
1×50÷5=10
5=50
4=?
4×50÷5=40
Answer =10:40
Answer:
10
Step-by-step explanation:
1/2 * 20 / 1 =
(20 * 1) / ( 2 * 1) = 10