Life expectancy of dollar bill = d
life expectancy of coin = c
d = 1/20 c
substitute value in for c (30)
d = 1/20 * 30
d = 30/20
d = 1.5
life expectancy of a dollar bill = 1.5 years

Then, now that we have solved for T, we can evaluate and solve for t=20 minutes.
Answer:
(28-32)/32 = 4/32 = 1/8 = 0.125 = 12.5%
Step-by-step explanation:
Answer:
The answer is don't ask me to explain cuz i can't O.O
but there yea go :3
Step-by-step explanation:
Answer:
7
Step-by-step explanation:
Step 1:
18 - 5w + 7w - 4 = 28
Step 2:
14 + 2w = 28
Step 3:
2w = 14
Answer:
w = 7
Hope This Helps :)