Gasoline has a density of 0.749 g/mL . There are 454 grams in a pound and 3.7854 L in a gallon. How many Pounds does 19.2 gallons of gasoline weigh? Respond with correct number of significant figures in "E" notation.

119.9 pounds

Or 1.199e2 in E notation

Explanation:

First, find the total amount of liters.

3.7854 x 19.2 = 72.67968

There are 72.67968 liters of gasoline

Then, convert the liters to milliliters

72.67968 x 1000 = 72,679.68

There are 72,679.68 milliliters of gasoline

Now, convert it to grams

72,679.68 x 0.749 = 54,437.08032

There are 54,437.08032 grams of gasoline

Convert the grams to pounds

54,437.08032 ÷ 454 = 119.9054632599119

Round it with sig figs and you will find out the weight of the gasoline is 119.9 pounds.

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.