Answer:

Step-by-step explanation:
Notice when x increases 1, y is 4 times the previous one, so
the function is like 
To determine the constant C, put any pair of (x, y)
Use x = 0, y = 0.2, so
0.2 =
= C * 1 = C
then 
Answer:
4 5
Step-by-step explanation:
4 5 = 45
Ax+By=C , where A=0, B is positive , and C is negative
so y = - C/B (less than 0)
So answer is the last one. (y = -3)
Your answer would be 454.
81.72 is 18% of 454.
You're welcome ;)