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Unformatted text preview:ecalculus
Ch. 3. Quiz #1
9. If the population of a city was 250.000 in 1998 and was 500.000 in 2013. what can you expect the population of
that city to be in 2025?
d= 2013-1998=15
P= 250,000 . 2 27/15
t= 2025-1998=27
P2 870, 550
10. Calculate the decibels of a fire alarm if the intensity is / = 3.16 W/m.
(3:142 ) = 125 decibles
D= 10 log ( 10+12)
11. Calculate the magnitude of an earthquake whose energy release measured 1 x 1014 joules.
M= log ( 10".) = 6.4 joules
12. You open a savings account with an initial deposit of $500 that pays 1.3% interest per year.
a. How much money will you have in 7 years if the interest is compounded quarterly?
A= 500 (1+ +013) 4(7 ) $ 547.55
b. How much money will you have in 7 years if the interest is compounded continuously?
A = SOOe .15:74 $ 547. 63 .
13. A radioactive isotope given to a medical patient to treat a tumor has a half-lite of 2.807 days. If a patient is given
150 milligrams, how many milligrams will be left after 5 days?
m= 150e-0.247(120) 20. 060000600620/ mg
~ 2.O1E-1 mg
In2 20.247
120 hr