Answer:
1. 15%
2. 85%
Step-by-step explanation:
The graph is 100 units,
the shaded part is 15 units,
so it is 15%,
if it is 15% than the unshaded part is 85%.
8,4
You always get from one term to the next by adding 6:
So, the rule is "add 6"
b = 2A - a
a + b = 2A
(a + b)/2 = A