Answer:
A. 
Step-by-step explanation:
I could not make clarifications of what you are asking, but this is similar to 
I am joyous to assist you anytime.
I know I got the last one wrong, so I will hopefully get this one right
I am not that great with Proportional and Not Proportional, but
1. Y is 0.5 times x
2. Y is 1.5 times x
If it is on sale for 15%, then you are paying 85% (100-15) of the original price.
To find 85% of 850, you do 850*.85 to get $722.50
Hope this helps
Here you go the answer for the question
step by step have no idea but it's a