Use sum-to-product formulas to rewrite the expression as a product.cos 5x + cos 3x
A. 2 cos 4x
B. 2 sin 4x sin x
C. 2 cos 4x sin x
D. 2 cos 4x cos x
Answer: D
Mathematics
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Find the product, if possible. 
A. 
B. 
C. 
D. Not defined
Mathematics
Solve by the method of elimination by substitution.0.4x + 0.6y = -2.6x - 0.5y = -0.5
A. x = -0.2, y = -0.3 B. x = -2, y = -3 C. x = -3, y = -2 D. Inconsistent
Mathematics
Use the rules for exponents to rewrite the expression and then evaluate the new expression. (-2)2(-2)3
A. -64
B. -32
C. 
D. 
Mathematics
Combine. Assume that all variables represent non-negative real numbers.5
+ 
A. 20
B. 6
C. 9
D. 5
+ 
Mathematics