7. The half-life of Z0-71 is 4.25 minutes. At t = 0, there were yo grams of Zn-71, but only 1/64 of this amount
remains after some time How much time has passed?
at 20.5
b. t = 19.5
c. t= 21.
d. t = 25.5
8. Which of the following situations does not describe an exponential decay?
a. the number of rabbits doubles every month
b.the amount of substance decrease every 10 minutes
c. the atmospheric pressure decreases as you go higher
by the amount of substance decreases every 10 minutes
d. the value of a car depreciates every year
9. A photocopier ts purchased for P15,200.00 and depreciates in value by 15% per year. Which equation best describes the
value of the photocopier in x years?
a. Y= 15200 (0.15)X
b.y= 15200 (0.85)*
c.y= 15200 (1.15)
d.y= 15200 (1.85)
10. Suppose P4000.00 is invested at 6% interest com unded annually.How much money will there be in the bank at the
end of 5 years?
a. 15 352.90
b. P5,325.90
C. P5,253.90
d. +5,235,90
11. in 2012 the population of schoolchildren in a city was 90,000. This population increases at a rate of 5% each year.
What will be the population of school children in year 2022?
a. 148,385 school children.
c. 165, 373 school children
b. 150,625 school children
d. 190, 428 school children
For items 12-13, refer to the following:
The population of Lucena City is estimated to increase by 1.49% per year. According to 2015 census, the
population of the city is 266, 248.
12. Which of the following best modelled the situation?
a. A = 266248e(0.0149) ()
bA=266248(1.0149)
CA=266248 (-1)
d A=266248e(1.0149) (t)
13. What will be the population ten years from now?
a. 309,027
b. 332,929
c.350,456
d. 402, 123
14. Joana earned P1500 last summer. If she deposited the money in a bank account that earns 5% interest compounded yearly,
how much money willshe have after five years?
a. P2,015,35
b. P1,914.42
c. P1,846.48
d. P3,560.15
15. If the population of a town doubles in 30 years, when will it bequadruple?
a. in 45 years
c. in 90 years
d. in 100 years
10149
b. in 60 years

patulong naman salamat ​