Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Rewrite the expression with a positive rational exponent. Simplify, if possible.9-3/2
A. 
B. 
C. - 
D. - 
Mathematics
List the elements in the set .Let U = {q, r, s, t, u, v, w, x, y, z} A = {q, s, u, w, y} B = {q, s, y, z} C = {v, w, x, y, z}. (B' ? C)' ? A
A. {q, r, s, t, u, w, y, z} B. {q, s, u, y} C. {q, s, u, v, w, x, y} D. {q, r, s, t, u, v, w, x, y}
Mathematics
Find the LCD for the given rational expressions.
, 
A. x(x + 9)(x - 6) B. (x + 9)2 C. x(x + 3)(x - 6) D. x(x + 9)2
Mathematics
Find the requested number.5 less than 
of a number is -10. What is the number?
A. -5
B. -15
C. 
D. 15
Mathematics