Answer:
slope = -2
Step-by-step explanation:
(-5,2) (-8,8)
equation to find slope: 
= 
= 
= -2
47% of them were bacteria, which means 53% of them were not bacteria.
47+53=100 or 100-47=53
I hope this helps :)
Let t = number of hours
The first candle starts at 8 inches.
It burns at 7/10 inch per hour, so in t hours it burns (7/10)t inches.
After t hours, its length is 8 - (7/10)t
The second candle starts at 6 inches.
It burns at 1/5 inch per hour, so in t hours it burns (1/5)t inches.
After t hours, its length is 6 - (1/5)t
You want the lengths to be equal, so the equation is
8 - (7/10)t = 6 - (1/5)t
C=d x pi
d= 24
C= 24 x 3.14
C=75.36 inches
hope this helps
