Solve the differential equation using the method of variation of parameters. Select the correct answer.
a. 
Mathematics
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Find the exact value under the given conditions.Given sin ? = - 
, with ? in quadrant IV, and tan ? = - 
, with ? in quadrant II. Find cos (? + ?).
A. - 
B. 
C. 
D. - 
Mathematics
Solve the problem.The formula P = 14.7e-0.21x gives the average atmospheric pressure, P, in pounds per square inch, at an altitude x, in miles above sea level. Find the average atmospheric pressure for an altitude of 2.3 miles. Round your answer to the nearest tenth.
A. 11.0 lb/in.2 B. 7.8 lb/in.2 C. 9.1 lb/in.2 D. 8.4 lb/in.2
Mathematics
Use the definition of positive integer exponents.
Simplify the expression 
Mathematics
Simplify.-4b + 6b
A. -10b B. -2b C. 2b2 D. 2b
Mathematics