Acar has a mileage rating of 40 miles per gallon of gasoline.

how many miles can the car travel on 60.5 liters of gasoline?

The car can travel 639.3 miles on 60.5 liters of gasoline

Solution:

Given that car has a mileage rating of 40 miles per gallon of gasoline

To find: Number of miles can the car travel on 60.5 liters of gasoline

Let "x" be the number of miles the car travel on 60.5 liters of gasoline

Let us first convert 60.5 liters of gasoline to gallons of gasoline

Use the conversion factor,

1 liter = 0.264172 gallon

60.5 liters = 0.264172 x 60.5 gallon

60.5 liters = 15.98241 gallon

Thus from given statement,

1 gallon of gasoline = 40 miles

15.98241 gallon = x miles

This forms a proportion and we can solve the sum by cross multiplying

Thus the car can travel 639.3 miles on 60.5 liters of gasoline

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

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.