The burden of human made aerosol sulfate in the earth's atmosphere, in grams per square meter, is
?
?
where x is the total weight of aerosol sulfate emitted into the atmosphere per year and n is the number of years it remains in the atmosphere. A is the surface area of the earth, approximately 
square meters. Calculate the burden given the 1995 estimated values of 
grams per year and 
days. Enter the number of grams per square meter as a number without the units. Round to three decimal places.
?
A. 0.061 grams per square meter
B. 0.098 grams per square meter
C. 0.031 grams per square meter
D. 0.767 grams per square meter
E. 11.200 grams per square meter
Answer: C
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A. -4y + 15 B. -36y + 15 C. 44y - 15 D. 36y - 15
Solve. Round your answer to three decimal places if necessary.4x = 
A. 
B. 3
C. -3
D. 
Identify the figure and name it using the labels shown.
A. point W
B. ?W
C. ray W, or 
D. line W, or 
First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.James is taking a road to Calistoga. He has already driven 73.38 kilometers. If the entire distance to Calistoga is 115 kilometers, how much further must James drive?
A. Estimate: 30 kilometers; exact: 42.62 kilometers B. Estimate: 30 kilometers; exact: 41.72 kilometers C. Estimate: 40 kilometers; exact: 51.62 kilometers D. Estimate: 30 kilometers; exact: 41.62 kilometers