The amount of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in a city has been approximated by
?
?
where ?A?(?t) is measured in pollutant standard index (PSI), and t is measured in hours, with 
corresponding to 5 a.m. Use the trapezoidal rule with 
to estimate the average PSI between 5 a.m. and noon. Please round the answer to the nearest hundredth. (Hint: 
.)
?
__________ nitrogen dioxides
Fill in the blank(s) with the appropriate word(s).
105.65
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Simplify the expression by combining like terms.4y + y - 7y
A. -3y B. -2y C. -4y D. -3y + y
Solve the problem.The half-life of silicon-32 is 710 years. If 60 grams is present now, how much will be present in 300 years? (Round your answer to three decimal places.)
A. 3.208 B. 0 C. 58.268 D. 44.767
Solve the equation by factoring.4x2 + 15x - 4 = 0
A. 
B. 
C. 
D. 
Solve the problem.Given a triangle with 
, 
, what is (are) the possible length(s) of c? Round your answer to two decimal places.
A. 6.61 B. 14.21 C. 16.42 or 3.41 D. 16.42 or 2.44