You stop at a self-service gas station to buy 15 gallons of 87-octane gasoline at $2.1 a gallon. The gas pump is accurate to within 
of a gallon. How much might you be undercharged or overcharged?
Round your answer to two decimal places.
?
A. $0.42
B. $2.1
C. $0.21
D. $4.20
E. $0.021
Answer: C
Mathematics
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Find the indicated rate.The city where Lu Na lives has a population of 2,265,900 people and an area of 108.6 square miles. What is the rate of number of people per square mile (the population density)?
A. 246,076,740 people/sq mi B. 0.0000479 people/sq mi C. 21,908 people/sq mi D. 20,865 people/sq mi
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Graph the inequality.y < - 
x + 2
A. 
B. 
C. 
D. 
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Solve the system by elimination.
A. (6.5, -10.5) B. (6.5, 10.5) C. (4, 6.5) D. (4, -10.5)
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Find all specified roots.Seventh roots of 1.
A. 1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
B. -1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
C. 1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
D. 1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
, -1
Mathematics