The current population of tanzania is 49.3 million with a population growth rate of 2.93% per year. the average annual agricultural yield in tanzania is 8500 kg/ha (where "ha" means hectare, which you can think of as a metric acre), a yield that is comprised of both grains (e. g. maize/corn) and tubers (e. g. cassava root) in a 1: 1 ratio. the total amount of cropland farmed in tanzania is 4,000,000 ha. the average agricultural output has increased at a linear rate of about 1.5% per year for the last five years or so. ideally, one person should have a caloric intake of at least 2000 kcal per day in order to maintain their life. 1 kg grain supplies 3000 kcal; 1 kg tubers supplies 1000 kcal. use the equations from our mini-lecture and the linear growth equation from the last module's quantitative assignment, to answer the following questions. you will also have to do some conversions for which you won't find specific equations.
how many years would you predict it would take for tanzania's population to double? hint: think doubling time as we've described it in the module 3 mini-lecture. round your answer to one place past the decimal.

120,630,890

step-by-step explanation:

110+10=120,620+10=630,880+10=890

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).