Use sum-to-product identities to rewrite the expression as a product.cos 39° - cos 57°
A. -2 cos 48° cos 9°
B. 2 sin 48° cos 9°
C. -2 sin 48° sin 9°
D. 2 sin 48° sin 9°
Answer: D
Mathematics
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Solve the problem.Which of the lines in the picture are lines of symmetry of the given figure?
A. p and r B. No reflection symmetry C. Only r D. q and s
Mathematics
Use radical notation to write the expression. Do not simplify.(x + 5)1/2
A. 
B. z + 
C. 
D. 
+ 
Mathematics
Translate the phrase to an algebraic expression. Use x to represent "a number."The product of -20 and a number
A. -20 - x
B. -20 + x
C. -20 ? x or -20x
D. x ÷ (-20) or 
Mathematics
Find the cumulative distribution function for the given probability density function.f(x) = 
x1/2; [1, 9]
A. F(x) = 
, 1 ? x ? 9
B. F(x) = 
, 1 ? x ? 9
C. F(x) = 
, 1 ? x ? 9
D. F(x) = 
, 1 ? x ? 9
Mathematics