Simplify the expression.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: C
Mathematics
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Establish the identity.cos(4?) = cos4 ? - 6 sin2 ? cos2 ? + sin4 ?
What will be an ideal response?
Mathematics
Solve the problem.An electrician charges a fee of $45 plus $30 per hour. Let y be the cost in dollars of using the electrician for x hours. Find the slope-intercept form of the equation.
A. y = 45x + 30 B. y = 30x - 45 C. y = 45x - 30 D. y = 30x + 45
Mathematics
Solve the system of equations using substitution.
A. x = 
, y = 3
B. x = 3
, y = 
C. x = 9, y = 
D. x = 
, y = 9
Mathematics
Find the general term, an, of the given arithmetic sequence.2, 6, 10, 14, 18, . . .
A. an = 4n - 1 B. an = 2n - 4 C. an = 2(2n - 1) D. an = 2(4)n-1
Mathematics