Express the sum or difference as a product.cos 
+ cos 
A. 2 sin 2x sin 
B. 2 sin 2x sin x
C. 2 cos 2x
D. 2 cos 2x cos 
Answer: D
Mathematics
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Factor completely. If the polynomial cannot be factored, write "prime."25x5 - 9x
A. (5x2 + 3)(5x2 - 3) B. x(5x2 + 3)(5x2 - 3) C. x(5x2 + 3)(x + 1)(x - 1) D. Prime
Mathematics
Determine the principal that must be invested at rate r = 5%, compounded monthly, so that $1,300,000 will be available for retirement in t = 10 years. (Round the answer to two decimal places.)
a. $ 989,309.35 b $ 889,309.35 c. $ 689,309.35 d. $ 789,309.35
Mathematics
Add or subtract. Express the answer as a mixed number.
A. 8
B. 16
C. 14
D. 15
Mathematics
Add. Do not use a number line except as a check.-8.3 + (-7.5)
A. 15.8 B. -0.8 C. -15.8 D. 0.8
Mathematics