Answer:
I thin B -7 cause its negative and negative goes down.
Step-by-step explanation:
Answer: The correct option is the third one; y=10(0.13)^x
Answer:
Center (4, -13)
Radius = 17
Step-by-step explanation:
Circle equation: 
(h, k) is the center of the circle and the r is the radius.

h = 4, k = -13, r = 17
The circumference equals diameter x pie which equals:
17x3.14=53.38cm.