Answer:
a.
500x+0.04=y
400x+0.05=y
for percentages move decimal to the left twice
y=x²+8
=(-2)²+8
=4+8
=12
Answer: r = - 20
Step-by-step explanation:
22
3.56 = 4
5.9 = 6
12.087 = 12
4+6+12 = 22