Add or subtract. Then simplify. If a denominator has two or more factors (other than monomials), leave it in factored form. Express the answer using the denominator of the first fraction when applicable.
- 
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Write the contrapositive of the statement. ~q ? ~p
A. p ? q B. q ? p C. ~(p ? q) D. ~(q ? p)
Mathematics
Establish the identity.
= 
What will be an ideal response?
Mathematics
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).
Mathematics
Find the indicated matrix.Let A = 
. Find 4A.
A. 
B. 
C. 
D. 
Mathematics