Suppose you wanted to estimate the number of dandelions in a field. It could take hours to count every single one, so ecologists use a SAMPLING technique. A single sample is used to estimate the size of the overall population

1. What might cause the estimate to be wrong with this method?

2. Why would it be difficult to use this method to estimate the population of fish?​

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.