9th grade algebra?
year- 0 1 2
# of trucks- 100 110 121

1. the table shows the number of trucks registered in a city each year. the growth is exponential. suppose the growth continues at the same rate.
how many trucks registered in the city in year 9?
round to the nearest whole number.

2. iodine-125 has a half-life of about 60 days.
how many milligrams of a 500 mg sample will remain after 300 days?
a) 0.6 mg
b) 7.8125 mg
c) 15.625 mg
d) 31.25 mg

3. after 6 years, what is the total amount of a compound interest investment of $35,000 at 4% interest, compounded quarterly?
a) $37,153.21
b) $39,438.88
c) $44,440.71
d) $56,295.30

4. the turtle population on an island is declining at a rate of 1.4% per year. the population was 3800 in the year 2009.
which answer is the best prediction of the population in the year 2014?
a) 3541
b) 3592
c) 3643
d) 3747

5. according to a research study in 2010, there were 440 coyotes in a given region, and the predicted growth rate was 17% each year.
according to the study, what would be the coyote population in 2030?
round the nearest whole number.