Simplify the expression by using a sum or difference identity.cos(13k) cos (6k) - sin(13k) sin (6k)
A. sin(19k)
B. cos(7k)
C. cos(19k)
D. sin(7k)
Answer: C
Mathematics
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Write the equation for the function having a graph that meets all of the specified conditions.Has the same shape as the graph of g(x) = 
x2 with vertex at (-3, 2).
A. f(x) = - 
(x - 3)2 + 2
B. f(x) = 
(x + 3)2 + 2
C. f(x) = 
(x - 3)2 - 2
D. f(x) = - 
(x + 3)2 + 2
Mathematics
Solve the exponential equation.2x = 18
A. 9.000 B. 0.240 C. 4.170 D. 2.197
Mathematics
Answer the question.Use two different methods to simplify the fraction. Explain each step of your work.
What will be an ideal response?
Mathematics
Perform the indicated operation. 
÷ 10
A. 
B. 
C. 
D. 
Mathematics