Answer:
40%
Step-by-step explanation:
The ratio is 20:50, we can expand to 40:100, so 40%
-- 30 miles per hour
-- $6.50 per hour
-- 365 days per year
-- 60 seconds per minute
-- $2.49 per pound
-- 3.47⁹ per gallon
-- 1800 calories per day
-- 360 degrees per revolution
Answer:
Equation: 3x - 11 = 85
Solution: x = 32
Step-by-step explanation:
3x - 11 = 85
You will have to do the opposite to the equation shown on the screen.
3x = 96 (85 + 11)
x = 32 (96 / 3)
Answer:
and 
Step-by-step explanation:
The equation of the isotope decay is:

14-Carbon has a half-life of 5568 years, the time constant of the isotope is:


The decay time is:
(There is no a year 0 in chronology).

Lastly, the relative amount is estimated by direct substitution:





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