Mr Wong predicted that he would sell 45 automobiles He actually sold 48 automobiles What are the values of a and b in the table below?
Percent Error
Error
Absolute error
Ratio
Item
Automobiles
Approximate value Exact value
45
48
Percent error
D
20
3
6.25%
0 - 20.6.6.26%
0 - 06.0%

Carbon- 14 is a radioactive form of carbon found in all living plants. after a plant dies, the carbon- 14 disintegrates. samples of similar living plants are used to determine the age of the remains. the amount of carbone-14 present after t years is given by the exponential equation n(t) = noe where no is the initial amount of carbon-14. the half-life of carbone-14 is 5600 years. charcoal from an ancient fire pit contains one third of earbon-14 found in similar living wood of the same size. find the age of the charcoal half-life is the time required for a quantity to reduce to half its initial amount