Use trigonometric identities to solve each equation in the interval [0, 2?]1 + cos x = 2 sin2 x
A. 
B. 
C. 
D. 
Answer: C
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Evaluate the integral using the given substitution.
dx , u = 4x - 6
A. - 
(4x - 6)-5 + C
B. - 
(4x - 6)-5 + C
C. (4x - 6)-5 + C
D. - 
(4x - 6)-7 + C
Solve the problem.An airline charter service charges a fare per person of $250 plus $20 for each unsold seat. The airplane holds 200 passengers. Let x represent the number of unsold seats and write an expression for the total revenue R for a charter flight.
A. R(x) = 200(250 + 20x) or 50,000 + 4000x B. R(x) = (200 - x)(250 + 20x) or 50,000 + 4000x - 20x2 C. R(x) = x(250 + 20x) or 250x + 20x2 D. R(x) = (200 - x)(250 + 20x) or 50,000 + 3750x - 20x2
Find the LCD. Do not combine fractions.
, 
A. 12a2b2 B. 3ab C. a2b2 D. 3a2b2
Solve the problem.3 times a number less than 7 times the same number is 40. Find the number.
A. -10 B. 10 C. 1.8 D. 4